Question

Light reflected from a spherical mirror of radius of curvature 30cm, falls on a piece of paper. the distance between the mirror and the paper is adjusted so as to form a small bright spot on the paper. after some time it was observed that the paper. after some time it was observed that the paper was charred
A) what type of spherical mirror is used and what is it's focal length?​


Please answer quickly

Answer 1

Answer:

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