Question

>What would be the refractive index of a medium with respect to vacuum if the velocity of light in the material reduces by 25%?

Answer 1

Answer:

Speed of light in air is c. Let the refractive index of medium w.r.t air n.

Speed of light in medium decreases by 40% of c.

Thus speed of light in medium v=0.6c

Using n=

v

c

∴ n=

0.6c

c

⟹ n=

6

10

=1.67