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If the wavelength of incident light on a concave mirror is increased, how will the focal length of the mirror change ?

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If the wavelength of incident light on a concave mirror is increased, how will the focal length of the mirror change ?
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The focal length of the mirror does not change on changing the wavelength of light incident on it. This is because `f = R//2`, i.e., `f` depends only one radius of curvature of the mirror.
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