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NCERT Solutions Class 10 Science - Free PDF Download Feb 14, �� NCERT Books Class 10 Science: Science is one of the most important and high scoring subjects for CBSE Class 10 board exam. Thus, it becomes very important to be thorough with your studies and never miss a single topic for the exam. To help you in the process, we at Embibe have provided CBSE Class 10 Science book PDF. Jul 12, �� Class 10 NCERT Science Books are created by the best professors who are experts in Science and have good knowledge in the subject Class 10 Science. CBSE Class 10 NCERT Science books are available in both English as well as Hindi Medium, for students of respective English and Hindi medium schools. The NCERT Books for Class 10 are designed as per the syllabus followed National Council Of Educational Research And Training provides detailed and step-by-step solutions to all the questions relating to the NCERT myboat349 boatplans give invaluable help to the students when they are in need of help with their homework, or even while preparing for the examinations and when learning.
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Draw the ray diagram and find the position, size and the nature of the image formed. The negative value of image height indicates that the image formed is inverted. The position, size, and nature of image are shown alongside in the ray diagram. Question 11 A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. Question 12 An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm.

Find the position and nature of the image. Thus, image is virtual, erect and diminished. What does this mean? Question 14 An object 5. Find the position of the image, its nature and size. Question 15 An object of size 7.

At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image. The image is real, inverted and enlarged in size. Question 16 Find the focal length of a lens of power What type of lens is this? Find the focal length of the lens. Is the prescribed lens diverging or converging? Reflection of light by curved surfaces; Images formed by spherical mirrors, center of curvature, principal axis, principal focus, focal length, mirror formula Derivation not required , magnification.

Refraction; laws of refraction, refractive index. Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula Derivation not required ; Magnification. Power of a lens;. Formulae Handbook for Class 10 Maths and Science.

Question 1. Define the principal focus of a concave mirror? Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.

This point is known as the principal focus of the concave mirror. Question 2. The radius of curvature of a spherical mirror is 20 cm. Question 3.

Name the mirror that can give an erect and enlarged image of an object. Answer: When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged. Question 4. Why do we prefer a convex mirror as a rear-view mirror in vehicles? Answer: Convex mirrors give a virtual, erect, and diminished image of the objects placed in front of them. They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind him.

Find the focal length of a convex mirror whose radius of curvature is 32 cm. A concave mirror produces three times magnified enlarged real image of object placed at 10 cm in front of it. A ray of light travelling in air enters obliquely into water.

Answer: The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal.

Light enters from air to glass having refractive index 1. Answer: Refractive index of a medium nm is given by,. Find out, from Table, the medium having highest optical density. A medium which has the highest refractive index will have the highest optical density and vice-versa.

It can be observed from table Therefore, diamond has the highest optical density and air has the lowest optical density. You are given kerosene, turpentine and water. Answer: The light can travel fast through water. Question 5. The refractive index of diamond is 2. This suggests that the speed of light in diamond will reduce by a factor 2. Define one dioptre of power of a lens? Answer: One dioptre is the power Of a lens Of focal length 1m.

Power of lens is defined as the reciprocal of its focal length. It is denoted by D. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image is equal to the size of the object?

Also find the power of the lens. The position of image should be double the focal length. Hence, the object should be at 2f. Find the power of a concave lens of focal length 2 m. Which one of the following materials cannot be used to make a lens? Where should an object b. A spherical mirror and a thin spherical lens have each a focal length of 15 cm.

The mirror and the lens are likely to be: a both concave b both convex c the mirror is Class 10th Ncert Science Book Chapter 10 Queen concave, but the lens is convex d the mirror is convex, but the lens is concave Answer: a Both concave. No matter how far you stand from a mirror, your Image appears erect. The mirror is likely to be a plane b concave c convex d Either plane or convex Answer: d Either plane or convex.

Question 6. Question 7. We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. For getting an erect image using a concave mirror, the object should be placed at a distance less than the focal length.

The image formed will be virtual, enlarged and erect. Question 8. Name the type of mirror used in the following situations.

Answer: a Concave mirror, to get powerful and parallel beams of light. Question 9. One half of a convex lens is covered with a black paper. Answer: Yes, even when one half of the lens is covered with a black paper, complete image of the object will be formed.

Take a convex lens and focus the light from a distant object onto a screen. As expected an image sharp is formed at a distance equal to the focal length Cover the lower or the upper half of the lens and focus the light from the same object onto the same screen.

You will be able to get a sharp image again; however the brightness of the image will be less in the second case. The ratio n2 is called refractive index of the second medium with respect to the first medium.

Refraction of light: The phenomenon of bending of light from its straight line path as it passes obliquely from one transparent medium to another is called refraction of light. The path of the ray of light in the first medium is called incident ray. The path of the ray of light in the second medium is called refracted ray. The angle between the incident ray and the normal at the surface of separation is called angle of incidence i.

The angle between the refracted ray and the normal at the surface of separation is called angle of refraction r. Question 1: Give three points of difference between real and virtual images.

Answer 1: Real Image: i Here the rays actually meet at the image point. Question 2: Distinguish between a concave and convex lens.

Answer 2: Convex lens a It is thicker at the centre than at the edges. Concave lens: a It is thinner at the centre than at the edges. Question 1: Define the principal focus of a concave mirror. Calculate the focal length of the mirror of radius of curvature of 20 cm.

Answer 1: The principal focus of concave mirror is a point on its principal axis at which a beam of light parallel to the principal axis actually converges after reflection from the mirror.

Question 2: State the type of mirror preferred as i rear view mirror in vehicles, ii shaving mirror. Justify your answer giving two reason in each case. Answer 2: i A convex mirror is preferred as a rear-view mirror because a It always forms an erect, virtual and diminished image of an object placed anywhere in front of it. To improve your scores, you should solve practice questions and take mock tests. The tests offered at Embibe will help you in managing your time in an efficient manner.

After taking the Class 10 mock tests, your confidence will increase and you will do fewer mistakes during the board exam. If you have any queries, post them in the comment box below. We will get back to you at the earliest. Explore Embibe to have an online learning experience that is user friendly!

Support: support embibe. General: info embibe. The respective PDF will appear. Save it. NCERT textbooks include all fundamental and basic concepts for each subject. Students get a Class 10th Ncert Science Book Chapter 1 China chance to practice thoroughly for exams as NCERT books also contain numerous problems, questions, and exercises. Download Here.

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