Question

What is the velocity of light in vacuum if the velocity of light in a medium of refractive index 1.2 is \( v \, ms^{-1} \)?

• A. \( \frac{v}{1.2} \, ms^{-1} \)
• B. \( 2.4v \, ms^{-1} \)
• C. \( 1.2v \, ms^{-1} \)
• D. \( 3 \times 10^8 \, ms^{-1} \)

Hint:

Refractive index \( n = \frac{c}{v} \), so vacuum speed is always greater than medium speed.

Answer 1

The Correct Option is C