what is the relation between wavelength and focal length of a convex and concave mirror
Both these things can not be related to each other since these are aspects of two different things.
Wavelength is the distance between two consecutive crests or troughs in a transverse wave and two consecutive compressions or rarefaction in a longitudinal wave i.e. its a property of a wave. While Focal length −The distance between the pole and the principal focus of the mirror is called the focal length (f) of the mirror i.e. its a property of a mirror itself.
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