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A screen beaming areal image of magnific...

A screen beaming areal image of magnification formed by a convex lens is moved through a distance x. The objectis the moved until a new image of magnification is formedon the screen. The focal length of the lens is :

A

`(x)/(m_(1)-m_(2))`

B

`(x)/(m_(1)-m_(2))`

C

`(x)/(sqrt(m_(1)m_(2)))`

D

None of these

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