Question

______ this is the unit of refractive index.

Options

• cm

• m

• degree

• Refractive index has no unit

Answer 1

Refractive index has no unit this is the unit of refractive index.

Explanation:

Refractive index is defined as the ratio of the speed of light in a vacuum to the speed of light in a given medium (n = `c/v`). Because it is a ratio of two identical physical quantities (velocities), their units cancel each other out, leaving it as a dimensionless number.