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A convex lens is dipped in a liquid whos...

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will .........

A

become zero

B

remain unchanged

C

become infinite

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B, C
Focal length in liquid,
`(1)/(f_1)=(n_g/n_L-1)(1/R_1-1/R_2)`
`n_g=n_1`
`therefore(1)/(f_L)=(1-1)(1/R_1-1/R_2)`
`therefore (1)/(f_L)=0`
`thereforef_L`=Infinite
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