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 10 m s.​

Answer 1

Answer:

Speed of light in vacuum, c = 3 — 108 ms-1

Refractive index of glass = 1.50

Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass  = c/ng

=3 — 108/1.50

= 2x 108 ms-1.

Explanation:

Answer 2

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

Speed of light in vacuum, c = 3 — 108 ms-1

Refractive index of glass, ng = 1.50

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

= c/ng

=3 — 108/1.50 = 2x 108 ms-1.