Question

For total internal reflection to take place a ray of light must ______.

Options

• travel from denser to rarer medium.

• travel from rarer to denser medium.

• medium does not play any role

• none of these

Answer 1

For total internal reflection to take place a ray of light must travel from denser to rarer medium.

Explanation:

Total internal reflection occurs when light travels from an optically denser medium to an optically rarer medium and its angle of incidence is greater than the critical angle. The other options do not give the required direction of travel or condition.