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Lens Formula and Magnification

The relation ...

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The relation between intensity (I) of image formed by a spherical mirror and area of aperture (A) is ?? it is given Intensity is directly proportinal to area of aperture shouldn't it be that intensity is directly proportional to ( aperture )^2

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Q. The relation between intensity (I) of image formed by a spherical mirror and area of aperture (A) is

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