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A convex lens of refractive index 3/2 ha...

A convex lens of refractive index 3/2 has a power of `2.5^(@)`. If it is placed in a liqud of refractive index 2,the new power of the lens is

A

2.5D

B

`-2.5D`

C

1.25D

D

`-1.25D`

Text Solution

Verified by Experts

The correct Answer is:
D
(d) We have,P=`(µ-1)[1/R_(1)-1/R_(2)]`
`2.5=(3/2-1)(1/R_(1)-1/R_(2))`
`P=((3//2)/2-1)(1/R_(1)-1/R_(2))`
`therefore` P=-1.25D`
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DC PANDEY-RAY OPTICS-Checkpoint 9.4
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