A lens is placed between a source of light and a wall. It forms images of area A1 and A2 ontbe wall,
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If a lens is placed between a source of light and a wall .It forms images of area A1 and A2 on the wall .
The area of source of light is √(A_1 A_2 ).
A lens is a transparent curve device that is used to forge light.
The lenses are usually made from glass. There are two
Different size for lens They are called concave and convex.
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