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NCERT Solutions for Class 10 Chapter 10 Image 7 The image is located at a distance of 6 cm from the mirror on the other side of the mirror. The positive and a value of less than 1 of magnification indicates that the image formed is virtual and erect and diminished. 13. The magnification produced by a plane mirror is +1. What does this mean? Answer- The positive sign means an image formed by a plane mirror is virtual and erect. Since the magnification is 1 it means that the size of the image is equal to the size of the object. 14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image. Answer- Object distance (u) = – 20 cm Object height (h) = 5 cm Radius of curvature (R) = 30 cm Radius of curvature = 2 × Focal length R = 2f f = 15 cm According to the mirror formula, NCERT Solutions for Class 10 Chapter 10 Image 8 The positive value of image height indicates that the image formed is erect. Hence, the image formed is erect, virtual, and smaller in size. 15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image. Answer- Object distance (u) = – 27 cm Object height (h) = 7 cm Focal length (f) = – 18 cm According to the mirror formula, NCERT Solutions for Class 10 Chapter 10 Image 9 The negative value of image height indicates that the image formed is inverted. 16. Find the focal length of a lens of power -2.0 D. What type of lens is this? Answer- Power of lens (P) = 1/f P = -2D f = -1/2 = -0.5 m A concave lens has a negative focal length. Therefore, it is a concave lens. 17. A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging? Answer- Power of lens (P) = 1/f P = 1.5D f = 1/1.5 = 10/15 = 0.66 m A convex lens has a positive focal length. Therefore, it is a convex lens or a converging lens.

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What happen when metals are burnt in air

Posted by Prajwal K 3 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Vani Singh 3 years, 3 months ago

They formed metal oxide

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Siddharth Singh 3 years, 4 months ago

They Form Metal Oxides by reacting with O² present in the air . For Eg :- 2Mg+0²=2Mgo

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H I M A N S H U ... 3 years, 4 months ago

The metal convert into metal oxide due to the presence of oxygen present in the atmosphere

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Vansh Singh 3 years, 4 months ago

Metallic Oxides are formed as metals react with oxygen present in air.

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SinA + CosA = √2 Then, tanA + CotA= ?

Posted by Iron Man 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

K.Haniskha💖💖🥰 Kandi☺️ 3 years, 4 months ago

2 is the correct answer

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Student Student 3 years, 4 months ago

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Shreya Gupta 3 years, 4 months ago

SinA=√2 - cosA Perpendicular =√2 - cosA Hypotenuse = 1 H^2=P^2+B^2 1^2=(√2 - cosA)^2+ B^2 1=√2^2+CosA^2 - 2×√2×CosA + B^2 1=2+cos^2A - 2√2cosA + B^2 -1=cos^2A - 2√2cosA+ B^2 B^2=-1- cos^2A + 2√2cosAB B=√(-1- cos^2A + 2√2cosAB) tanA + CotA= ? TanA=P/B= √2 - cosA/√(-1- cos^2A + 2√2cosAB) CotA=B/P √(-1- cos^2A + 2√2cosAB)/√2 - cosA tanA + CotA= ? √2 - cosA/√(-1- cos^2A + 2√2cosAB) + √(-1- cos^2A + 2√2cosAB)/√2 - cosA

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State the properties of magnetic field ines

Posted by Muskan Manjhi 3 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Shagun Sood 3 years, 3 months ago

Magnetic field lines appear to emerge or start from the north pole and merge or terminate at the south pole. Inside the magnet, the direction of the magnetic field lines is from the south pole to the north pole. Magnetic field lines never intersect with each other. Magnetic field lines form a closed-loop.

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Siddharth Singh 3 years, 4 months ago

Some Properties of magnetic field lines are :- 1) They Never Intersect each other . 2) Originate from north pole and end at south Pole. 3)The More curves will be there in magnetic field lines the stronger will be it's magnetic field. 4)They Are like Closed Curves,As they end at a point . 5)They are crowded at the poles that is why there is maximum magnetic attraction 🧲 at The poles

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Mahi Yadav 3 years, 4 months ago

1 They travel North Pole to South Pole outside the magnet and South Pole to North Pole inside the magnet. 2 They are closed and continues curves.

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Prajwal K 3 years, 4 months ago

1. They r parallel 2. Never meet each other 3.Magnetic force is maximum at the poles 4. They flow from south pole to North pole

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Nenere is the information is acquired in neurons?

Posted by Saran Saran 3 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Prabhroop Kaur 3 years, 3 months ago

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Focal length of concave mirror

Posted by Priya Pillai 3 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Vansh Singh 3 years, 4 months ago

Negative

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Shreya Gupta 3 years, 4 months ago

Is always negative

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Akash Singh 3 years, 4 months ago

Negative

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Iron Man 3 years, 4 months ago

Focal length of concave mirror is negative.

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Soumya Ranjan Majhi 3 years, 4 months ago

Negative

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Electricity notes

Posted by Nala Nala 3 years, 4 months ago

CBSE > Class 10 > Science

0 answers

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What is tropic movement ? Explain with eg

Posted by Khushi Kumari 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Sanika Khanzode 3 years, 4 months ago

Tropic movements happen as a result of growth of a plant part in the direction of the stimulus. There are four types of tropic movements, viz. geotropic, phototropic, hydrotropic and thigmotropic. Example : Roots usually show positive geotropic movement, i.e. they grow in the direction of the gravity.

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Piyush Jain 3 years, 4 months ago

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Saksham Singh 3 years, 4 months ago

Tropic( turning) movement is growth movement affected by external stimuli such as light,water and chemical etc. It is basically 5 types: 1 phototropism 2 hydrotropism 3 geotropism 4 chemotropism 5 thigmotropism

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Light notes

Posted by Riddhima Pandey 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Prabhroop Kaur 3 years, 3 months ago

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Vikash Kumae 3 years, 4 months ago

What is chemical reaction

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Vikash Kumae 3 years, 4 months ago

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GUYS I AM SORRY IT WAS MY FRIEND U WROTE THOSE WORDS I AM REALLY SORRY 🙏

Posted by Âťťíťůđē Bøý 3 years, 4 months ago

CBSE > Class 10 > Science

0 answers

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Why potatoes are grown in acidic soil

Posted by Itika Kansal 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Sanika Khanzode 3 years, 4 months ago

In fact, potatoes are one of the few vegetable crops that can tolerate and thrive in more acidic soils — soils in the 4.8 to 6.0 pH range. Potatoes may not do well in soils with a pH higher than 7, because if the pH level is high, many of the nutrients that potatoes require to grow will not be available.

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Kajal Verma 3 years, 4 months ago

As it can tolerate pH of soil lower than 5

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Jaya Satone 3 years, 4 months ago

IT is like base

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What colour is the precipitate obtain when AgNo3+Nacl=Agcl+NaNo3

Posted by Eswar Paduku 3 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Saksham Singh 3 years, 4 months ago

White

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in which *** organisms are found

Posted by Faisal Khan 3 years, 4 months ago

CBSE > Class 10 > Science

0 answers

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Nutrition in human being point

Posted by Baishya Mohanty 3 years, 4 months ago

CBSE > Class 10 > Science

0 answers

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Definition of ionic compound

Posted by Anuj Sharma 3 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Chinki 🦋👈🏻 3 years, 4 months ago

Ionic bond = Bond formed due to complete transfer of e‐

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Chinki 🦋👈🏻 3 years, 4 months ago

The compounds formed by the ionic bond between cation (metals) & anion (non metal)...

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Which fertilization is known as Triple fusion ? Why ?

Posted by Jai Hind 3 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

If anyone need some basic concepts of physics with practicals experiment then contact me ,

Posted by ᥫ᭡ㅤᏒᴀᴜsʜꫝɴ .. 3 years, 4 months ago

CBSE > Class 10 > Science

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Name two factors on which the focal length of a lens depends.

Posted by Juhi Kushwaha 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Faisal Khan 3 years, 4 months ago

Focal length of a lens depends on the refractive index of the glass from which it is made, and on the curvature of its two surfaces .

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ᥫ᭡ㅤᏒᴀᴜsʜꫝɴ .. 3 years, 4 months ago

If you want to know how then contact me, I am just a small teacher

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ᥫ᭡ㅤᏒᴀᴜsʜꫝɴ .. 3 years, 4 months ago

Centure of curvature and refractive index of lens

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What is meaning ductility

Posted by Neha Neha 3 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Faisal Khan 3 years, 4 months ago

the quality or state of being ductile especially : the ability of a material to have its shape changed (as by being drawn out into wire or thread) without losing strength or breaking When certain alloys are added to metal, hardness and strength can be improved without decreasing the ductility. —

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Aditya Verma 3 years, 3 months ago

Chutiya

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Kirtika Ki 3 years, 4 months ago

Ductility is a property of a metal in which it can be drawn into wires.. Ex: copper,silver etc.

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Neha Neha 3 years, 4 months ago

What is meaning ductility

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1: What is concentrated acid?

Posted by Aniket Yadav 3 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Nikhil Sir 3 years, 4 months ago

A acid which contains a large amount of acid and small amount of water is called concentrated acid

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Aniket Yadav 3 years, 4 months ago

Concentrated Acid : A concentrated acid contains a large amount of acid (higher concentration of hydronium ions) and a small amount of water.

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1)why does sun appear yellow 2)why are clouds white 3)explain why planets do not twinkle 4)why do stars twinkle

Posted by Muhammed Hassan 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Shreya Sahu 3 years, 4 months ago

because twinkle bigger in size and nearer to the planet and small variation in their position it is not noticeable that's why planet do not twinkle

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Neha Neha 3 years, 4 months ago

Why do Star twinkle

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Khushi Khushi 3 years, 4 months ago

Who du products

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The image of an object placed in front of a convex mirror is formed at

Posted by Arvind Bishnoi 3 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Omya Aryan 3 years, 4 months ago

Either at Focus or between Pole and Focus (in convex mirror)

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Ravi Shankar 3 years, 4 months ago

The image of an object placed in front of a convex mirror is always formed diminished, virtual and erect.

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Jyoti Singh 3 years, 4 months ago

It's depends on the place of object ...if object is at infinity then image shall be highly diminished and if object is b/w infinity and optical centre then image formed is diminished.....and in both the condition the nature of image is virtual and erect

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Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

WTF

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Keshav Sharma 3 years, 4 months ago

नमस्ते आप कैसे हैं?

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Which part of brain is responsible for vomiting????¿

Posted by Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Ayush Yadav 3 years, 4 months ago

Medulla

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Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

Wow u guys are so intelligent 👍

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Saanve Krishna 3 years, 4 months ago

Medulla oblongata

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Safa Riya 3 years, 4 months ago

medulla oblongeta

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Which are the 5 plant harmons are ???

Posted by Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

Yeappp right its short form is A CAGE A-AUXIN C-CYTOKININ A-ABSICIC ACID G-GIBBERILIN E-ETHLENE.......

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Safa Riya 3 years, 4 months ago

auxin ,cytokinin,gibberilins,absicic acid,ethlene

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What is hyper myopia

Posted by Khushal Chudasama 3 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Sahil Singh 3 years, 4 months ago

It is near Sightednes defect in this effect people unable to see near by object clearly

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Anshu Yadav 3 years, 4 months ago

The person can see far object cleary but cannot see near by object

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Safa Riya 3 years, 4 months ago

The person can see far object but cant see near by objects

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Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

The person who haves near sightedness.

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Sarthak Parth 3 years, 4 months ago

Hyper myopia is a in which we are unable to see near by objects

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Who discovered atom .

Posted by Mohd Sanib 3 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Neha Neha 3 years, 4 months ago

Why do Star twinkle

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Sneha 💜💜💜Ms. Jeon Jungkook 💜💜 3 years, 4 months ago

John dalton

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Saanve Krishna 3 years, 4 months ago

John Dalton

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Mohd Sanib 3 years, 4 months ago

Democritus called it atom

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Mohd Sanib 3 years, 4 months ago

Indian philosopher Maharishi kanad was the the first to to discover this atom and called it PARMADU

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List all the chemical formule

Posted by Koustub Hidakal 3 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Adarsh Rai 3 years, 4 months ago

There's more like Neutralisation reaction Endothermic reaction Exothermic reaction And subtypes of decomposition reaction

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Omya Aryan 3 years, 4 months ago

CaSo4.1/2H20 :- Plaster of Paris

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Anup Kumar Sharma 3 years, 4 months ago

Chemical reaction Decomposition reaction Displacement reaction Double displacement reaction Oxidation and reduction

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see that the different parts of our body have specific functions. Our mouth waters when we see the food welke our meaning to. Our heart's beat without our thinking about it. In fact, we cannot coomtral these actions raily by king about them even if we want to Sa in between the simple reflex actions like change in the size of the pupil, and thought out actions such as moving a chair, there is another set of muscle movemetes over which we do not have any sking control. Many of these involuntary actio are-controlled by the mid-brain and hind-brain. All these involuntary com including blood pressure, salivation and vomiting are controlled by the medulla in the hind-brain. Think about activities like walking in a straight line, riding a bicycle, picking up a pencil. These are possible due to a part of the hind bin called the cerebellus. It is responsible for the precision of voluntary actions and maintaining the posture and balance if the body Imagine what would happen if each of these events failed to take place if we were not thinking about it Answer the following questions: Spinal Cost and ly the part of the nervous system which control the reflex action, Does flex action involve all parts of the voluntary nervous system? the part of the automic nervous system which control involuntary actions Being of heart muscles, which type of actions is this? Out of voluntary and involuntary action which it swat!

Posted by Shubham Sathe 3 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Why twinkling of stars happen

Posted by Sana Javed 3 years, 4 months ago

CBSE > Class 10 > Science

5 answers

Faisal Khan 3 years, 4 months ago

The stars seem to twinkle in the night sky due to the effects of the Earth's atmosphere.

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Safa Riya 3 years, 4 months ago

because of atmospheric refraction

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Omya Aryan 3 years, 4 months ago

Unlike planets, stars are very far from us, so it is considered as a point size from earth and Due to large distance it seem to be twinkling from earth because of atmospheric refraction.

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Tanisha Agarwal 3 years, 4 months ago

Because of refraction

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Yashmeen Kaur 3 years, 4 months ago

Due to the effects of earth's atmosphere

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