Question

What happens to the speed of light when it travels from an optically denser medium to an optically rarer medium?

Options

• It remains the same in both media.

• It decreases in the second medium.

• It becomes zero in the second medium.

• It increases in the second medium.

Answer 1

Light travels faster in an optically rarer medium than in an optically denser medium. Its speed therefore increases when it enters the second medium.