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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

8 cm

B

20 cm

C

30 cm

D

40 cm

Text Solution

Verified by Experts

The correct Answer is:
D
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