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  4. Concave mirror of focal length f(in air) is immersed in water of μ=(4/3) . The focal length of the mirror will be :-

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Q. Concave mirror of focal length f(in air) is immersed in water of $\mu=\frac{4}{3} .$ The focal length of the mirror will be :-

Ray Optics and Optical Instruments

Solution:

For mirror focal length doesn't depend on medium