Question

The speed of light in air is 3 X 108 m/ sec. Calculate the speed of the light in the medium, if the refractive index of the medium in 7/3.

Answer 1

Answer:

According to Snell's Law:

sin r

sin i

=

n

1

n

2

=

v

2

v

1

and Refractive Index for air is ≈1

Substituting,

1

1.5

=

v

2

3×10

8

Therefore, v

2

=

1.5

3×10

8

=2×10

8

m/s