Geometrical Optics

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

The prism has nv = 1.5 & nr = 1.48.

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

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

2 Answers

varun.tinkle ·

what is the question asking angular or average dispersion

Upendra Tagare ·

Dispersion = $v-$r=(nv-nr)×A

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

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