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Light of wavelenght 4000 A is incident a...

Light of wavelenght `4000 A` is incident at small angle on a prim of apex angle `4^(@)` . The prism has `n_(v)=1.5` and `n_(r)=1.48` . The angle of dispersion produced by the prism in this light is:

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The angular dispersion produced by a prism of angle 5^@ is [n_V = 1.665, n_r = 1.645]