Geometrical OpticsHard

Question

A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall, for its two different positions. The area the source of light is :

Options

A.
B.
C.
D.None

Solution

Am = A1 ; A = A2
⇒ A2 = A1A2 ⇒ A =

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