Question

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An object of height 0.2m is placed some distance from a converging lens of focal length 0.6m. An image is seen on a screen placed 0.8m behind the screen.
Calculate the object distance

Answer 1

Explanation:

There is a relation connecting object distance (u),image distance (v) and the focal length (f) of a lens. v=uf/(u-f) So if you know the other two variables, v can be found out. If the object is at infinity ( far away from the lens) then v=f.