CBSE Class 12-science Answered
A convex lens of refractive index 1.5 has a focal length of cm in air.
Calculate the change in its focal length when it is immersed in water of refractive index
Asked by Topperlearning User | 07 Jul, 2014, 06:21: PM
Expert Answer
Reflective index of convex lens in air, μ= 1.5
Focal length of convex lens a = 18 cm
Reflective index of water, μ' =
Where R1 and R2 are the radius of curvature of the convex lens
When the lens is in water
Where is the focal length of the lens, when immersed in water
Change on focal length = = 72 cm - 18 cm = 54 cm
Answered by | 07 Jul, 2014, 08:21: PM
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