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why have we taken I∝(πd^2)/4 as (πd^2)/4 is the area of a whole circle.The spherical mirror is only a segment of the circle.SO why did we use the formula to find the area of a whole square here?

Answer» why have we taken I∝(πd^2)/4 as (πd^2)/4 is the area of a whole circle.The spherical mirror is only a segment of the circle.SO why did we use the formula to find the area of a whole square here?


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