a convex lens of focal length 50 cm is placed 20cm in front of a plane mirror. light from very far away source falls on the lens the distance of final image from the mirror is what ?
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Explanation:
There is a relation connecting object distance (u),image distance (v) and the focal length (f) of a lens.
1/u+1/v=1/f
1/v=1/f-1/u
v=uf/(u-f) So if you know the other two variables, v can be found out.
In this case object is at infinity ( far away from the lens) then v=f.
Given:
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