A) become small, but non-zero
B) remain unchanged
C) become zero
D) become infinite
Correct Answer: D
Solution :
From lens maker's formula |
(i) |
When convex lens is dipped in a liquid of refractive index then its focal length |
or ....(ii) |
Dividing Eq. (i) by Eq. (ii), we get |
....(iii) |
But it is given that refractive index of lens is equal to refractive index of liquid i.e., . |
Hence, Eq. (iii) gives, |
(infinity) |
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