The focal length of a plano convex lens is 
and its refractive index is 1.5 . It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes 
. Then the refractive index of the liquid is
Text Solution
Verified by ExpertsThe correct answer is:
C
:
According to lens maker's formula
The focal length of plano convex lens is
or 
(i)
The focal length of liquid lens is
effective focal length of the combination is
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