Question

A ray of light falls normally on the face of a prism of refractive index 1.5 . Find the angle of the prism if the ray just fails to emerge from the second face

Answer 1

• Let C is be termed as the angle of incidence on the second face of the prism

• If the ray is not able to emerge, it means that the angle of refraction is equal to 90 degrees

• Since C=0.6667

• This helps to calculate, that the critical angle= 48 degrees