Question

Question No 1 to 10 carries one mark each, question 11 carries 2 marks, question 12 carries 3 marks and
question no 13 carries 5 marks.
1. Write down four important characteristics of image formed by a plane mirror.
2. Define the term reflection.
3. Light enters from air to glass having refractive index 1.50. What is the speed of light in glass? Speed of light in air
is 3X 10 m/s.
4. The image of an object placed in front of a convex Mirror is formed at
(a) the object itself
(b) twice the distance of the object in front of the Mirror
(c) half the distance of the object in front of the Mirror
(d) behind the mirror
5. An object is placed at a distance of 10 cm in front of a plane mirror, then the distance of image from mirror Will
be
(a) 5 cm. (b) 10 cm
(c) 20 cm. (d) 0
6. The radius of curvature of concave mirror is 12 cm. Then, the focal length will be
(a) 12 cm. (b) 6 cm
(C) -24 cm. (d) -6 cm
7. The centre of the reflecting surface of a spherical Mirror is a point called the
8. Assertion : Large concave mirrors are used to concentrate sunlight to produce heat in solar cookers.
Reason: Concave mirror converges the light rays Falling on it to a point.
(a) Both assertion (A) and reason (R) are true and Reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true
9. Assertion: A ray incident along normal to the mirror Retraces its path.
Reason: In reflection, angle of incidence is always Equal to angle of reflection.
(a) Both assertion (A) and reason (R) are true and Reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true
10. Assertion: When a concave mirror is held under Water, its focal length will increase.
Reason: The focal length of a concave mirror is Independent of the medium in which it is placed.
(a) Both assertion (A) and reason (R) are true and Reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true​

Answer 1

Answer:

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