Question

Refractive index of a transparent medium, so that it is invisible in vacuum is

• A. 1
• B. <1
• C. >1.33
• D. 1.33

Answer 1

The correct option is A 1

Vacuum has a refractive index of 1. For the transparent medium to be invisible in vaccum, it should have a refractive index equal to that of vacuum i.e. equal to 1.

Hence, the correct answer is OPTION A.