Q

An object 21 cm in front of a convex mirror forms an image 7 cm behind it. If the object moves to 14 cm in front, what is the new image distance?

RRB Group-D 19/09/2022 / Shift-III 2022
✓ Answer: A +6 cm
Initially 1/f = 1/7 − 1/21 = 2/21, so f = 10.5 cm. Then 1/v = 1/10.5 + 1/14 = 1/6, giving v = +6 cm.
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