Question

What is the refractive index of a vacuum?

• A. 1
• B. 2
• C. 1.5
• D. 0.5

Answer 1

The correct option is A 1

Refractive Index of a Vacuum is 1, Refraction Index is represented by symbol n which is expressed relative to the speed of light in a vacuum. The index of refraction value of a material is a number that indicates the number of times slower that a light wave would be in that material than it is in a vacuum.

Also nothing can travel faster than the speed of lightin a vacuum and lightin a vacuumalways travels at the same speed.