CBSE - X - Physics - Light - Reflection and Refraction
All these are equivalent,
1/ Aperture of a spherical mirror is the diameter of the reflecting surface, the straight line distance between two farthest point on the periphery of the mirror.
2/ In general aperture refers to a tiny hole, you'll encounter this in diffraction, and interference phenomena.
3/ What's the measure of the area exposed to the incident light, it's the area of the mirror, and it's measure is the diameter from which we can obtain the area.
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