The index of refraction for flint glass is 1.5. This means that
A) light travels faster in this substance than it does in vacuum.
B) the wavelength of light passing through glass is 1.5× longer as it is in vacuum.
C) the speed of light is slower in this substance than it is in vacuum.
D) a ray of light is refracted away from the normal as it passes from air into glass.

Question

Quizplus · Accepted Answer

The index of refraction indicates how much slower light travels in a medium compared to vacuum. An index of 1.5 means light travels 1.5 times slower in flint glass than in vacuum.

The Index of Refraction for Flint Glass Is 1