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Assertion : A double convex lens (mu=1.5...

Assertion `:` A double convex lens `(mu=1.5)` has focal length `10 cm`. When the lens is immersed in water `(mu=4//3)` its focal length becomes `40 cm`.
Reason `:` `(1)/(f)=(mu_(1)-mu_(m))/(mu_(m))((1)/(R_(1))-(1)/(R_(2)))`

A

If both the assertion and reason are true and reason explains the assertion.

B

If both the assertion and reason are true but reason does not explain the assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
A
Focal length of lens immersed in water is four times the focal length of lens in air. If means
`f_(w)=4f_(a)=4xx10=40cm`
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