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A spherical of radius of curvature R, se...

A spherical of radius of curvature `R`, separates a rarer and a denser medium as shown in Fig. Complete the path of the incident ray of light, showing the formation of a real image. Hence derive the relation connecting object distance `u`, image distance `v`, radius of curvature `R` and the refractive indices `n_1 and n_2` of the two media. Briefly explain how the focal length of a convex lens changes with increase in wavelength of incident light.
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