Optics Question 695

Question: A thin glass (refractive index 1.5) lens has optical power of 5D in air. It’s optical power in a liquid medium with refractive index 1.6 will be

[AIEEE 2005]

Options:

A) 25 D

B) ? 25 D

C) 1 D

D) None of these

Show Answer

Answer:

Correct Answer: D

Solution:

flfa=(aμg1)(lμg1)

Therefore flfa=aμg1lμg1=1.511.51.61=0.5×1.60.1=8

Therefore Pl=Pa8=58



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