Question

# What is the SI unit of measurement of refractive index of a medium?

- m
- m
^{2} - m/s
- It is unitless

^{2}Hint:

### The refractive index is a **dimensionless number. **

## The correct answer is: It is unitless

### The refractive index is unitless.

- SI unit is a system of internationally accepted units for measurement.
- The refractive index depends on the speed of light and the density of the medium.
- The refractive index is defined as the quotient of the speed of light as it passes through two media.
- Since it is a dimensionless number, it has no SI unit.

### Related Questions to study

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