A lens is placed in between of source and wall in such a way that the area of images on wall for two different positions are A_1 and A_2 then what would be the area of source ?

A lens is placed in between of source and wall in such a way that the

1.	A lens is placed in between of source and wall in such a way that the area of images on wall for two different positions are A_1 and A_2 then what would be the area of source ?
Answer» `(A_1+A_2)/2` `[1/A_1+1/A_2]^-1` `root_(A_1A_2)` `[(root_A_1+root_A_2)/(2)]^2` SOLUTION :`m=sqrt(m_1m_2)`[`because m PROP A`] `thereforeA=sqrt(A_1A_2)`

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A lens is placed in between of source and wall in such a way that the area of images on wall for two different positions are A_1 and A_2 then what would be the area of source ?

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