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How will the focal length of a concave m...

How will the focal length of a concave mirror change if the wavelength of the light falling on the mirror is made twice ?

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There will be no change in focal length, as focal length does not depend on the wavelength of the light.
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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Very Short Answer Questions)
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  2. What is the focal length of a plane mirror ?

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  11. A biconcave lens made of a transparent material of refractive index 1...

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  14. For the same value of angle of incidence, the angles of refraction in ...

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