Question

light enters from air to glass plate having refractive index 1.50 what is the speed of light in glass the speed of light in vacuum is 3 into 10 to the power 8 M per second

Answer 1

R.I. of glass =speed of light in air/speed of light in glass
1.50=3 X 108/speed of light in glass
Speedof light in glass= 3 X 108/1.50
Speed of light in glass = 2 X 108 m/s

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Answer 2

2x10^8 is the right answer