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