Question

A larger refractive index of a medium means that light travels:

Options

• more slowly in that medium

• faster in that medium

• at the same speed as in vacuum

• with zero speed in that medium

Answer 1

Since \[n = \frac{c}{v}\], a larger refractive index corresponds to a smaller speed v of light. Hence, a larger refractive index means light travels more slowly in that medium.