the effective diameter of the light reflecting area of the mirror
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The effective diameter of the light reflecting area of the mirror is called as Aperture .
Aperture is the reflecting surface area exposed to the light.
Mirror whose aperture is smaller than its focal length, we use the formula
f=R/2
The above formula applies to convex and concave mirror
For plane mirror, Radius of curvature is infinity.
refer the attachment for the diagram
Here MN refers to Aperture.
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