A concave mirror's focal length is $f$ in air. Its water focal length (refractive index $\frac{4}{3}$ ) will be

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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

A concave mirror is one that has the inside surface of a spherical mirror as the reflecting surface. It is also known as a focusing mirror or a converging mirror.

The focal length of a concave mirror is the distance between the pole (center of reflecting surface) and the focus (F).

When concave mirrors are immersed in water, the focal length of the mirrors does not change.

Hence option (A) is correct.

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