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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 of the lens. Then its focal length will

A

decrease

B

become zero

C

remain unchanged

D

become infinite

Text Solution

Verified by Experts

The correct Answer is:
D
In this case, `n_(1)=n_(2)`. There is no change in refractive index.
Hence there is no refraction.
`therefore (1)/(f)=((n_(2))/(n_(1))-1)((1)/(R_(1))-(1)/(R_(2)))`
`=(1-1) ((1)/(R_(1))-(1)/(R_(2)))=0`
`therefore f=oo`
Thus its focal length becomes infinity.
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