{"id":4428,"date":"2016-05-16T09:49:00","date_gmt":"2016-05-16T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-ray-optics-and-optical-instruments-part-2\/"},"modified":"2018-10-22T16:42:17","modified_gmt":"2018-10-22T11:12:17","slug":"ncert-solutions-class-12-physics-ray-optic-optical-instruments-part-2","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-ray-optic-optical-instruments-part-2\/","title":{"rendered":"NCERT Solutions class 12 physics Ray Optics and Optical Instruments 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-12-physics-ray-optic-optical-instruments-part-2\/#NCERT_Class_12_Physics_Chapter-wise_Solutions\" >NCERT Class 12 Physics 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-12-physics-ray-optic-optical-instruments-part-2\/#CHAPTER_9_RAY_OPTICS_AND_OPTICAL_INSTRUMENTS\" >CHAPTER 9 RAY OPTICS AND OPTICAL INSTRUMENTS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-ray-optic-optical-instruments-part-2\/#NCERT_Solutions_class_12_physics_Ray_Optics_and_Optical_Instruments_Part_2\" >NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-ray-optic-optical-instruments-part-2\/#NCERT_Solutions_for_Class_12_Physics\" >NCERT Solutions for Class 12 Physics<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2 Class 12 Physics Class 12 Physics 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 12 Physics chapter wise NCERT solution for Physics part 1 and Physics part 2 for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p><strong>Download\u00a0<a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/ncert-solutions\/5\/\">NCERT solutions for\u00a0Ray Optics and Optical Instruments Part 2\u00a0<\/a>as PDF.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/Class%2012%20physics%20book%2012.jpg\" alt=\"NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2\" width=\"132\" height=\"162\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_12_Physics_Chapter-wise_Solutions\"><\/span><strong>NCERT Class 12 Physics Chapter-wise Solutions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1 \u2013 Electric Charges and Fields<\/li>\n<li>2 \u2013 Electrostatic Potential and Capacitance<\/li>\n<li>3 \u2013 Current Electricity<\/li>\n<li>4 \u2013 Moving Charges and Magnetism<\/li>\n<li>5 \u2013 Magnetism and Matter<\/li>\n<li>6 \u2013 Electromagnetic Induction<\/li>\n<li>7 \u2013 Alternating Current<\/li>\n<li>8 \u2013 Electromagnetic Waves<\/li>\n<li>9 \u2013 Ray Optics and Optical Instruments<\/li>\n<li>10 \u2013 Wave Optics<\/li>\n<li>11 \u2013 Dual Nature of Radiation and Matter<\/li>\n<li>12 \u2013 Atoms<\/li>\n<li>13 \u2013 Nuclei<\/li>\n<li>14 \u2013 Semiconductor Electronic: Material, Devices and Simple Circuits<\/li>\n<li>15 \u2013 Communication Systems<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CHAPTER_9_RAY_OPTICS_AND_OPTICAL_INSTRUMENTS\"><\/span>CHAPTER 9 RAY OPTICS AND OPTICAL INSTRUMENTS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>9.1 Introduction<\/li>\n<li>9.2 Reflection of Light by Spherical Mirrors<\/li>\n<li>9.3 Refraction<\/li>\n<li>9.4 Total Internal Reflection<\/li>\n<li>9.5 Refraction at Spherical Surfaces and by Lenses<\/li>\n<li>9.6 Refraction through a Prism<\/li>\n<li>9.7 Dispersion by a Prism<\/li>\n<li>9.8 Some Natural Phenomena due to Sunlight<\/li>\n<li>9.9 Optical Instruments<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_class_12_physics_Ray_Optics_and_Optical_Instruments_Part_2\"><\/span>NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2<strong>\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>20:\u00a0A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.<\/p>\n<p>21:\u00a0 (a) Determine the &#8216;effective focal length&#8217; of the combination of the two lenses in Exercise 9.10, if they are placed 8.0 cm apart with their principal axes coincident. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notion of effective focal length of this system useful at all?<\/p>\n<p>(b) An object 1.5 cm in size is placed on the side of the convex lens in the arrangement (a) above. The distance between the object and the convex lens is 40 cm. Determine the magnification produced by the two-lens system, and the size of the image.<\/p>\n<p>22:\u00a0At what angle should a ray of light be incident on the face of a prism of refracting angle 60\u00b0 so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.<\/p>\n<p>23:\u00a0 You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will<\/p>\n<p>(a) deviate a pencil of white light without much dispersion,<\/p>\n<p>(b) disperse (and displace) a pencil of white light without much deviation.<\/p>\n<p>24:\u00a0 For a normal eye, the far point is at infinity and the near point of distinct vision is about 25cm in front of the eye. The cornea of the eye provides a converging power of about 40 dioptres, and the least converging power of the eye-lens behind the cornea is about 20 dioptres. From this rough data estimate the range of accommodation (i.e., the range of converging power of the eye-lens) of a normal eye.<\/p>\n<p>25:\u00a0Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?<\/p>\n<p>26:\u00a0A myopic person has been using spectacles of power -1.0 dioptre for distant vision. During old age he also needs to use separate reading glass of power + 2.0 dioptres. Explain what may have happened.<\/p>\n<p>27:\u00a0 A person looking at a person wearing a shirt with a pattern comprising vertical and horizontal lines is able to see the vertical lines more distinctly than the horizontal ones. What is this defect due to? How is such a defect of vision corrected?<\/p>\n<p>28:\u00a0 A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm.<\/p>\n<p>(a) What is the closest and the farthest distance at which he should keep the lens from the page so that he can read the book when viewing through the magnifying glass?<\/p>\n<p>(b) What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple microscope?<\/p>\n<p>29:\u00a0 A card sheet divided into squares each of size 1 mm2is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye.<\/p>\n<p>(a) What is the magnification produced by the lens? How much is the area of each square in the virtual image?<\/p>\n<p>(b) What is the angular magnification (magnifying power) of the lens?<\/p>\n<p>(c) Is the magnification in (a) equal to the magnifying power in (b)?<\/p>\n<p>Explain.<\/p>\n<p>30: (a) At what distance should the lens be held from the figure in<\/p>\n<p>Exercise 9.29 in order to view the squares distinctly with the maximum possible magnifying power?<\/p>\n<p>(b) What is the magnification in this case?<\/p>\n<p>(c) Is the magnification equal to the magnifying power in this case?<\/p>\n<p>Explain.<\/p>\n<p>31: What should be the distance between the object in Exercise 9.30 and the magnifying glass if the virtual image of each square in the figure is to have an area of 6.25 mm2. Would you be able to see the squares distinctly with your eyes very close to the magnifier?<\/p>\n[<em>Note:<\/em> Exercises 9.29 to 9.31 will help you clearly understand the difference between magnification in absolute size and the angular magnification (or magnifying power) of an instrument.]\n<p>32:\u00a0 Answer the following questions:<\/p>\n<p>(a) The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification?<\/p>\n<p>(b) In viewing through a magnifying glass, one usually positions one&#8217;s eyes very close to the lens. Does angular magnification change if the eye is moved back?<\/p>\n<p>(c) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?<\/p>\n<p>(d) Why must both the objective and the eyepiece of a compound microscope have short focal lengths?<\/p>\n<p>(e) When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?<\/p>\n<p>33:\u00a0 An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25 cm and an eyepiece of focal length 5 cm. How will you set up the compound microscope?<\/p>\n<p>34:\u00a0 An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25 cm and an eyepiece of focal length 5 cm. How will you set up the compound microscope?<\/p>\n<p>35:\u00a0 A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. What is the magnifying power of the telescope for viewing distant objects when<\/p>\n<p>(a) the telescope is in normal adjustment (i.e., when the final image is at infinity)?<\/p>\n<p>(b) the final image is formed at the least distance of distinct vision (25 cm)?<\/p>\n<p>36:\u00a0(a) For the telescope described in Exercise 9.34 (a), what is the separation between the objective lens and the eyepiece?<\/p>\n<p>(b) If this telescope is used to view a 100 m tall tower 3 km away, what is the height of the image of the tower formed by the objective lens?<\/p>\n<p>(c) What is the height of the final image of the tower if it is formed at 25 cm?<\/p>\n<p>37:\u00a0 A Cassegrain telescope uses two mirrors as shown in Fig. 9.33. Such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of the large mirror is 220 mm and the small mirror is 140 mm, where will the final image of an object at infinity be?<\/p>\n<p>38: Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. A current in the coil produces a deflection of 3.5\u00b0of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?<\/p>\n<p><img decoding=\"async\" id=\"Picture 192\" style=\"height: 99px; width: 217px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch09\/image358.jpg\" alt=\"14148487034534.jpg\" \/><\/p>\n<p>39:\u00a0 Figure 9.37 shows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45.0 cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30.0 cm. What is the refractive index of the liquid?<\/p>\n<p><img decoding=\"async\" id=\"Picture 194\" style=\"height: 110px; width: 129px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch09\/image361.jpg\" alt=\"14148487128923.jpg\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_12_Physics\"><\/span><strong>NCERT Solutions for Class 12 Physics<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 12 Physics PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 12 physics includes text book solutions from both part 1 and part 2. NCERT Solutions for CBSE Class 12 Physics have total 20 chapters. 12 Physics NCERT Solutions in PDF for free Download on our website. Ncert physics class 12 solutions PDF and physics ncert class 12 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide<\/p>\n<p>To download\u00a0NCERT Solutions for class 12 Physics, Chemistry, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home 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 class 12 physics Ray Optics and Optical Instruments Part 2 Class 12 Physics Class 12 Physics 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 &#8230; <a title=\"NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-ray-optic-optical-instruments-part-2\/\" aria-label=\"More on NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1433],"tags":[283,320,1342,216],"class_list":["post-4428","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-physics-cbse-class-12","tag-cbse-study-material","tag-chemistry","tag-class-12","tag-ncert-solutions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions class 12 physics Ray Optics and Optical Instruments<\/title>\n<meta name=\"description\" content=\"NCERT Solutions class 12 physics Ray Optics and Optical Instruments Part 2 in PDF format for free download. 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