Question

If the critical angle for total internal reflection
from a medium to vacuum is 30°, then speed of
light in the medium:
​

Answer 1

Answer:

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Answer 2

Answer:

Critical angle for total internal reflection θ

c

=30

o

As we know, refractive index of air medium n

air

=1

Refractive index of the medium n=

sinθ

c

1

∴ n=

sin30

o

1

=

0.5

1

⟹ n=2

Velocity of light in medium v=

n

c

∴ v=

2

3×10

8

=1.5×10

8

m/s

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