A convex lens of refractive index 1.5 and focal length 
is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is 
. The value of 
is 
. (refractive index of water 
)
Text Solution
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(3) Using the lensmaker's equation, in air:
where 
for glass with 
.
In water:
Since 
,
We get 
, so 
.
The difference is 
.
Therefore 
.
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