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
A
3 dioptres
B
5 dioptres
C
7 diopters
D
9 diopters
Text Solution
Verified by ExpertsThe correct answer is:
B
(Focal length by displacement method)
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