Ray Optics and Optical Instruments

Question: A lens of refractive index $n$ is put in a liquid of refractive index $n'$ of focal length of lens in air is $f$, its focal length in liquid will be

1) $-\frac{fn'(n-1)}{n'-n}$

2) $-\frac{f(n'-n)}{n'(n-1)}$

3) $-\frac{n'(n-1)}{f(n'-n)}$

4) $\frac{fn'\,\,n}{n-n'}$

Solution:

Explanation: No Explanation

Refraction at Curved Surface

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