The focal length of a concave mirror is f when placed in air. What will be its focal length if it's placed in water having the refractive index of $\frac{4}{3}$ ?

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$f$

$\frac{3}{4} f$

$\frac{4}{3} f$

$\frac{7}{3} f$

answer is A.

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Detailed Solution

When a beam of parallel rays is incident on a concave mirror, rays meet at focus after reflection and the distance between the pole and the focus is called the focal length.
When concave mirrors are immersed in water, the focal length of the mirrors does not change as a reflection does not get affected when the medium is changed.

Therefore, the focal length of the concave mirror will be f in water as well.

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