The focal length of biconvex lens made of glass, of equal radii is 
. If the lens is dipped in the water, then the focal length becomes (Take, refractive index of glass and water as 
and 
, respectively)
A
B
C
D
(7/4)f
Text Solution
Verified by ExpertsThe correct answer is:
B
As per lens Maker's formula,
Here, 
and 
since biconvex lens
Now when the lens is dipped in the water,
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