A thin prism is made of material having refractive indices 1.61 and 1.65 for red and violet light. The dispersive power of the material is 0.07. It is found that a beam of yellow light passing through the prism suffers a minimum deviation of 4.0° in favorable conditions. Calculate the angle of the prism.

Given that


Refractive index of red light = μr = 1.61


Refractive index of violet light = μv = 1.65


Dispersive Power = ω = 0.07


Deviation angle = 40


Now,






Now,


Angle of minimum deviation





1