A concave mirror of focal length f (in air) i | vedclass

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(A) The focal length of a spherical mirror is given by the formula $f = R/2$,where $R$ is the radius of curvature of the mirror.This formula depends o

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$f$

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(A) The focal length of a spherical mirror is given by the formula $f = R/2$,where $R$ is the radius of curvature of the mirror.This formula depends only on the geometry of the mirror (the radius of curvature) and is independent of the refractive index of the medium in which the mirror is placed.Therefore,when the concave mirror is immersed in water,its focal length remains unchanged.Thus,the focal length in water is $f$.

$A$ concave mirror of focal length $f$ (in air) is immersed in water $(\mu = 4/3)$. The focal length of the mirror in water will be

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