NCERT Solutions Class 10 Science Chapter 10 Light Reflection And Refraction Download In Pdf
Question 1. Define the principal focus of a concave mirror.
Question 2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Question 3. Name a mirror that can give an erect and enlarged image of an object.
Question 4. Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Question 1. Find the focal length of a convex mirror whose radius of curvature is 32 cm.
Question 2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
Question 1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
Question 2. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.
Question 3. Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
Question 4. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
Question 5. The refractive index of diamond is 2.42. What is the meaning of this statement?
Question 1. Define 1 dioptre of power of a lens.
Question 2. 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 convex lens if the image is equal to the size of the object? Also, find the power of the lens.
Question 3. Find the power of a concave lens of focal length 2 m.
Question 1. Which one of the following materials cannot be used to make a lens? (a) Water (b) Glass (c) Plastic (d) Clay
Question 2. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus.
Question 3. Where should an object be placed in front of a convex lens to get a real image of the size of the object?
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.
Question 4. 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.
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