Answer:
Total internal reflection. Total internal reflection is the phenomenon in which a ray of light travelling at an angle of incidence greater than the critical angle from a denser to a rarer medium is totally reflected back into the denser medium, obeying the laws of reflection, as shown in Fig. 
Conditions for total internal reflection: 1. Light must travel from an optically denser to an optically rarer medium. 2. The angle of incidence in the denser medium must be greater than the critical angle for the two media.
You need to login to perform this action.
You will be redirected in
3 sec
