1.

A lens with a focal length of `16 cm` produces a sharp image of an object in two positions, which are `60 cm` apart. Find the distance from the object to the screen.

Answer» Correct Answer - A::C
`f=(d^2-x^2)/(4d)` (displacement method)
`f=16 cm,x=60 cm`
Substituting the values we get,
`d=100cm`


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