CBSE Class 12-science Answered
A convex lens of
refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length
when it is immersed in water of refractive index 
.
.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
For the lens in air,
or 
or 
When the lens is immersed in water
or 
or 
Change in focal length = 72 - 18 = 54 cm.
Answered by | 04 Jun, 2014, 03:23: PM
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