If the refractive index from air to glass is 
and that from air to water is 
, then the ratio of focal lengths of a glass lens in water and in air is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
: Given that, 
From lens maker's formula,
For glass lens in water,
For glass lens in air,
Dividing eqn (ii) by (i),
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