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A thin glass (refractive index 1.5) lens...

A thin glass (refractive index 1.5) lens has optical power of `-5D` in air. Its optical power in a liquid medium with refractive index 1.6 will be

A

25 D

B

`"- 25 "`D

C

1 D

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
`(f_(1))/(f_(a)) = ((n_(ga) - 1))/((n_(gl) -1)) = (1.5 - 1)/((1.5)/(1.6) -1)`
`rArr P_(l) = (-5)/(8) " " (because P_(a) = - 5D).`
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