Question

what is critical angle in short​

Answer 1

Answer:

Critical angle, in optics, the greatestangle at which a ray of light, travelling in one transparent medium, can strike the boundary between that medium and a second of lower refractive index without being totally reflected within the first medium.

Answer 2

Answer:

The angle of incidence when the angle of refraction is 90 o, and the ray changes from just refracting to total internal reflection, is called the critical angle.