Question

Light enters from air to glass having refractive index 1.50. What is the
speed of light in the glass? The speed of light in vacuum is 3 x 108 m s-
​

Answer 1

Answer:

Given parameters

Speed of light in vacuum (c) = 3 × 108 ms-1

Refractive index of glass (ng) = 1.50

Refractive index of a medium  = Speed of light in vacuum/Speed of light in the medium

Refractive index of glass = Speed of light in vacuum/Speed of light in the glass

Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass

v = c/ng

v = (3 × 108)/1.50

v = 2 × 108 ms-1

Answer 2

Answer:

Given that,

Refractive index μ=1.50

Speed of light c=3×10

8

m/s

We know that,

n

g

=

v

g

c

v

g

=

1.50

3×10

8

v

g

=2×10

8

m/s

Hence, the speed of light in glass is 2×10

8

m/s

Explanation:

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