Question

Q3. An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The
distance between the positions of the original and final
images seen in the mirror is:
(a) 2 cm
(b) 4 cm
(c) 10 cm
(d) 22 cm




II. Answer the following questions in one word or in one sentence.

04. Between which two points related to a concave mirror should an object be placed to obtain on a screen
an image twice the size of the object?





Q5. The radius of curvature of convex mirror is 20 cm. What is its focal length?


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Answer 1

Answer:

3) Ans is 4 cm

4)To obtain an image twice the size of the object, we must place it between F (focus) and P (pole) of the mirror, or between C (centre of curvature) and F (focus).

5) Here , f is focal length . Therefore , Therefore , the focal length of convex mirror is 10 cm .

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