Question

The refractive index of glass is 1.5 and water is 1.3. If speed of light in water is 2.25 x 10. What is speed of light in hlass

Answer 1

refractive index of water = speed of light in air / speed of light in water

thus 1.5 = 3×10 power 8 / 2.25×10 power 8

same way refractive index of glass = speed of light in air/ speed of light in glass

which is

1.3=3×10 power 8/ speed in glass

speed in glass = 2× 10 power 8