Optics Question 587

Question: A convex lens of focal length 84 cm is in contact with a concave lens of focal length 12 cm. The power of combination (in diopters) is

[MP PET 1991]

Options:

A) 25/24

B) 25/18

C) - 50/7

D) + 50/7

Show Answer

Answer:

Correct Answer: B

Solution:

Focal length of the combination 1F=1f1+1f2

=1(+84)+1(−12)

⇒F=−14 cm

∴P=100F=100−14=−507D

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