Q

Which statements about a spherical mirror are true? I. C is the centre of the sphere of which the mirror is a part. II. Aperture is the diameter of that sphere. III. F is midway between P and C.

RRB Group-D 06/10/2022 / Shift-I 2022
✓ Answer: B I and III only
I is correct, and III holds in the usual small-aperture approximation. Aperture is the diameter of the reflecting surface, not of the entire sphere.
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