Optics Question 632

Question: 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]

Options:

A) 3 dioptres

B) 5 dioptres

C) 7 diopters

D) 9 diopters

Show Answer

Answer:

Correct Answer: B

Solution:

f=D2x24D (Focal length by displacement method)

f=(100)2(40)24×40=21 cm

P=100f=100215D



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