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A glass convex lens of refractive index ...

A glass convex lens of refractive index `3/2` has got a focal length equal to 0.3 m. Find the focal length of the lens if it is immersed in water of refractive index` 4//3`.

Text Solution

Verified by Experts

As according to lens-makers’ formula
`f_(w)/f_(a)= ((mu_(g)-1))/((mu_(g)/mu_(w) -1)), f_(w)/0.3=((3/2-1))/(((3/2)/(4/3) -1))implies f_(w)=1.2m`
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