Question

If the angle of incidence of a light ray in denser medium is equal to its critical angle, what is the angle of refraction? ​

Answer 1

Answer:

90 degrees

When light strikes an interface with an angle of incidence equal to the critical angle, the angle of refraction equals 90 degrees. For any larger angle of incidence, the angle of refraction is not defined (since its sine becomes greater than 1.0, according to Snell's Law), and no light can pass over the interface.