Geometrical Optics

Light of wavelength 4000 A^o is incident at small angle on a prism of apex angle 4^o

The prism has n_v = 1.5 & n_r = 1.48.

The angle of dispersion produced by the prism in this light is ?

A)0.2^o B) 0.08^o C)0.192^o D)None of these

2 Answers

what is the question asking angular or average dispersion

Dispersion = $v-$r=(nv-nr)Ã—A

So dispersion =(1.50-1.48)Ã—.4=.08 degree

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