What is aperture of mirror????
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APERTURE OF MIRROR
In optics, an aperture is a hole or an opening through which light travels.
More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
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The diameter of the reflecting surface of spherical mirror is called its aperture. Mirrors whose aperture is much smaller than its radius of curvature, we use R=2f.
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