{"id":4063,"date":"2016-05-06T11:49:00","date_gmt":"2016-05-06T06:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/"},"modified":"2023-03-22T16:46:12","modified_gmt":"2023-03-22T11:16:12","slug":"ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/","title":{"rendered":"NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#NCERT_Class_10_Science_Chapter_wise_Solutions\" >NCERT Class 10 Science Chapter wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#NCERT_Solutions_for_Class_10_Science_Human_Eye_and_Colourful_World_Part_2\" >NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#1_The_human_eye_can_focus_objects_at_different_distances_by_adjusting_the_focal_length_of_the_eye_lens_This_is_due_to\" >1. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#2_The_human_eye_forms_the_image_of_an_object_at_its\" >2. The human eye forms the image of an object at its<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#3_The_least_distance_of_distinct_vision_for_an_eye_lens_is_caused_by_the_action_of_the\" >3. The least distance of distinct vision for an eye lens is caused by the action of the<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#4_The_change_in_focal_length_of_an_eye_lens_is_caused_by_the_action_of_the\" >4. The change in focal length of an eye lens is caused by the action of the<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#5_A_person_needs_a_lens_of_power_-55_dioptre_for_correcting_his_distinct_vision_For_correcting_his_near_vision_he_needs_a_lens_15_dioptre_What_is_the_focal_length_of_the_lens_required_for_correcting_i_distinct_vision_and_ii_near_vision\" >5. A person needs a lens of power -5.5 dioptre for correcting his distinct vision. For correcting his near vision he needs a lens +1.5 dioptre. What is the focal length of the lens required for correcting (i) distinct vision, and (ii) near vision?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#6_The_far_point_of_a_myopic_person_is_80_cm_in_front_of_the_eye_What_is_the_nature_and_power_of_the_lens_required_to_correct_the_problem\" >6. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#7_Make_a_diagram_to_show_how_hypermetropia_is_corrected_The_near_point_of_a_hypermetropic_eye_is_1_m_What_is_the_power_of_the_lens_required_to_correct_this_defect_Assume_that_near_point_of_the_normal_eye_is_25_cm\" >7. Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that near point of the normal eye is 25 cm.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#8_Why_is_a_normal_eye_not_able_to_see_clearly_the_objects_placed_closer_than_25_cm\" >8. Why is a normal eye not able to see clearly the objects placed closer than 25 cm?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#9_What_happen_to_the_image_distance_in_the_eye_when_we_increase_the_distance_of_an_object_from_the_eye\" >9. What happen to the image distance in the eye when we increase the distance of an object from the eye?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#10_Why_do_stars_twinkle\" >10. Why do stars twinkle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#11_Explain_why_the_planets_do_not_twinkle\" >11. Explain why the planets do not twinkle.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#12_Why_does_the_Sun_appear_reddish_early_in_the_morning\" >12. Why does the Sun appear reddish early in the morning?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#13_Why_does_the_sky_appear_dark_instead_of_blue_to_astronaut\" >13. Why does the sky appear dark instead of blue to astronaut?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#NCERT_Solutions_for_Class_10_Science\" >NCERT Solutions for Class 10 Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/#CBSE_app_for_Students\" >CBSE app for Students<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2 Class 10 Science Class book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE Board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 10 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Class 10 Science\u00a0Human Eye and Colourful World\u00a0<a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-10-science\/1176\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/10%20Science%20Book.jpg\" alt=\"NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2\" width=\"104\" height=\"128\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_10_Science_Chapter_wise_Solutions\"><\/span><span class=\"underline-text\">NCERT Class 10 Science Chapter wise Solutions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1 \u2013 Chemical Reactions and Equations<\/li>\n<li>2 \u2013 Acids, Bases and Salts<\/li>\n<li>3 \u2013 Metals and Non-metals<\/li>\n<li>4 \u2013 Carbon and Its Compounds<\/li>\n<li>5 \u2013 Periodic Classification of Elements<\/li>\n<li>6 \u2013 Life Processes<\/li>\n<li>7 \u2013 Control and Coordination<\/li>\n<li>8 \u2013 How do Organisms Reproduce?<\/li>\n<li>9 \u2013 Heredity and Evolution<\/li>\n<li>10 \u2013 Light Reflection and Refraction<\/li>\n<li>11 \u2013 Human Eye and Colourful World<\/li>\n<li>12 \u2013 Electricity<\/li>\n<li>13 \u2013 Magnetic Effects of Electric Current<\/li>\n<li>14 \u2013 Sources of Energy<\/li>\n<li>15 \u2013 Our Environment<\/li>\n<li>16 \u2013 Management of Natural Resources<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_10_Science_Human_Eye_and_Colourful_World_Part_2\"><\/span>NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6><span class=\"ez-toc-section\" id=\"1_The_human_eye_can_focus_objects_at_different_distances_by_adjusting_the_focal_length_of_the_eye_lens_This_is_due_to\"><\/span><strong>1. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) Presbyopia<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) Accommodation<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) Near-sightedness<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) Far-sightedness <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (b) <\/strong>accommodation<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_The_human_eye_forms_the_image_of_an_object_at_its\"><\/span><strong>2. The human eye forms the image of an object at its<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) Cornea<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) Iris<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) Pupil<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) Retina <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (d)<\/strong> retina<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_The_least_distance_of_distinct_vision_for_an_eye_lens_is_caused_by_the_action_of_the\"><\/span><strong>3. The least distance of distinct vision for an eye lens is caused by the action of the <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) 25 m<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) 2.5 cm<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) 25 cm<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) 2.5 m <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (c)<\/strong> 25 cm<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"4_The_change_in_focal_length_of_an_eye_lens_is_caused_by_the_action_of_the\"><\/span><strong>4. The change in focal length of an eye lens is caused by the action of the <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) Pupil<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) Retina <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) Cilliary muscles<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) Iris<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (c)<\/strong> Cilliary muscles<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"5_A_person_needs_a_lens_of_power_-55_dioptre_for_correcting_his_distinct_vision_For_correcting_his_near_vision_he_needs_a_lens_15_dioptre_What_is_the_focal_length_of_the_lens_required_for_correcting_i_distinct_vision_and_ii_near_vision\"><\/span><strong>5. A person needs a lens of power -5.5 dioptre for correcting his distinct vision. For correcting his near vision he needs a lens +1.5 dioptre. What is the focal length of the lens required for correcting (i) distinct vision, and (ii) near vision? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. (i)<\/strong> Power of lens needed for correction distant vision of the person (P) = -5.5 D<\/p>\n<p>Focal length of lens required for correcting distant vision (f)<\/p>\n<p>= 1\/P = 1\/-5.5 m = 0.18 m = 18 cm.<\/p>\n<p><strong>(ii)<\/strong> For correcting near vision the power of lens required (P) = +1.5 D<\/p>\n<p>Focal length of lens required for correcting near vision (f)<\/p>\n<p>= 1\/P = 1\/1.5 m = 0.67 m = 66.7 cm.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"6_The_far_point_of_a_myopic_person_is_80_cm_in_front_of_the_eye_What_is_the_nature_and_power_of_the_lens_required_to_correct_the_problem\"><\/span><strong>6. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>To correct the myopia the person concerned should use concave lens of focal length (f) = -80 cm = -0.80 m<\/p>\n<p>Power of lens (P) = 1\/f(m) = 1\/-0.80 = 100\/-80 = -1.25 D.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"7_Make_a_diagram_to_show_how_hypermetropia_is_corrected_The_near_point_of_a_hypermetropic_eye_is_1_m_What_is_the_power_of_the_lens_required_to_correct_this_defect_Assume_that_near_point_of_the_normal_eye_is_25_cm\"><\/span><strong>7. Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that near point of the normal eye is 25 cm. <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>Diagram representing the correction of hypermetropia is a follows:<\/p>\n<p><img decoding=\"async\" id=\"Picture 1\" style=\"height: 138px; width: 312px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/10\/science\/ch11\/image001.png\" \/><\/p>\n<p>Near point of defective eye is 1 m and that of normal eye is 25 cm.<\/p>\n<p>Here, u = -25 cm, v = -1m = 100 cm.<\/p>\n<p>Using lens formula<\/p>\n<p>1\/f = 1\/v \u2013 1\/u<\/p>\n<p>1\/f = 1\/-100 + 1\/25 = 3\/100<\/p>\n<p>f = 100\/3 cm = 1\/3m.<\/p>\n<p>P = 1\/f(m) = 1\/0.33 = +3.0 D.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"8_Why_is_a_normal_eye_not_able_to_see_clearly_the_objects_placed_closer_than_25_cm\"><\/span><strong>8. Why is a normal eye not able to see clearly the objects placed closer than 25 cm? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Due to limit of power of accommodation, the focal length of the eye lens cannot be decreased below certain minimum limit. So, a normal eye cannot see clearly the objects placed closer than minimum distance, called near point of the eye.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"9_What_happen_to_the_image_distance_in_the_eye_when_we_increase_the_distance_of_an_object_from_the_eye\"><\/span><strong>9. What happen to the image distance in the eye when we increase the distance of an object from the eye? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The image is formed on the retina even on increasing the distance of an object from the eye. In fact, the eye lens becomes thinner and its focal length increases as the object is moved away from the eye and consequently image is formed on the retina.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"10_Why_do_stars_twinkle\"><\/span><strong>10. Why do stars twinkle? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Stars twinkle due to atmospheric refraction of starlight. As the stars are very away they behave as almost point sources of light. As on account of atmospheric refraction, the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of light entering the eye flickers, so sometimes the star appear brighter and at some other time, fainter. Thus the stars twinkle.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"11_Explain_why_the_planets_do_not_twinkle\"><\/span><strong>11. Explain why the planets do not twinkle. <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Planets are much closer to the earth and are seen as extended source. So, a planet may be considered as a collection of a large number of point-sized light sources. Although light coming from individual point-sized sources flickers but the total amount of light entering our eye from all the individual point-sized sources average out to be constant. Thereby, planets appear equally brighter and there is no twinkling of planets.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"12_Why_does_the_Sun_appear_reddish_early_in_the_morning\"><\/span><strong>12. Why does the Sun appear reddish early in the morning? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>In early morning, the Sun is situated near horizon. Light from the Sun passes through thicker layers of air and covers a larger distance in earth\u2019s atmosphere before reaching our eyes. While passing through atmosphere blue light is mostly scattered away and the Sun appear reddish.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"13_Why_does_the_sky_appear_dark_instead_of_blue_to_astronaut\"><\/span><strong>13. Why does the sky appear dark instead of blue to astronaut? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans.<\/strong> Blue colour of the sky is on account of scattering of light of shorter wavelength by particles in the atmosphere of earth. If the earth had no atmosphere, there would not have been any scattering and sky would have looked dark. When astronaut in his spacecraft goes above the atmosphere of earth, sky appears dark to him because there is no scattering of light.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_10_Science\"><\/span>NCERT Solutions for Class 10 Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 10 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 10 Science includes text book solutions from Book. NCERT Solutions for CBSE Class 10 Science have total 16 chapters. 10 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 10 solutions PDF and Science ncert class 10 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Students\"><\/span>CBSE app for Students<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 10 Social Science, Computer Science, Home Science,Hindi ,English, Maths Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2 Class 10 Science Class book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE Board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are &#8230; <a title=\"NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-10-science-human-eye-and-colourful-world-part-2\/\" aria-label=\"More on NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":30040,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1367],"tags":[1043,283,438,216,349],"class_list":["post-4063","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-science-cbse-class-10","tag-cbse-class-10-science","tag-cbse-study-material","tag-class-10","tag-ncert-solutions","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Class 10 Science Human Eye and Colourful World Part 2<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 10 Science Human Eye and Colourful World Part 2 in PDF format for free download. 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