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
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a
≈3 diontres
b
≈5 dioptres
c
≈7 diopters
d
≈9 diopters
answer is B.
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Detailed Solution
f=D2−x24D (Focal length by displacement method)⇒f=(100)2−(40)24×100=21cm∴P=100f=10021≈5D
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