Question

write the cause of dispersion a ray of light passes through an equletral glass prism such that the angle of incidence is equal to the angle of imergence and each of these angles is equal to 3/4 of angle of prism find angle of deviation​

Answer 1

cause of dispersion is the different speed of light ray in different medium & the angle of incidence depend on the angle of prism and the angle of incidence : the angle of emergent is always equal to the angle of incidence hence angle of incidence is directly proportional to these angles