1.

The distance between an object and the screen is 100 cm. A lens produces an image on the screen when placed at either of the positions 40 cm apart. The power of the lens is [SCRA 1994]

A.            \[\approx \] 3 dioptres    
B.            \[\approx \] 5 dioptres
C.            \[\approx \] 7 diopters    
D.            \[\approx \] 9 diopters
Answer» C.            \[\approx \] 7 diopters    


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