Question

light enters from air to glass having refraction index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 m s -1

Answer 1

HEYA GM ❤

» μ¹ = AIR , μ² = GLASS

» μ¹ = AIR , μ² = GLASS » V¹ = VELOCITY OF LIGHT IN AIR / VACCUM , V² = Velocity of light in glass

★ By SNELL'S LAW

» μ¹ / μ² = v² / v¹

» 1 / 1.5 = V² / 3 × 10^8

» 3 × 10^8 / 1.5 = V²

» V² = 2 × 10^8 m/s

★ Hence ; Velocity of Light in Glass is

2 × 10^8 m/s.

TQ ❤ ❤

Answer 2

Explanation:

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.