Question

speed of light in air is 3 into 10 raise to power 8 M per second and the speed of light in glass is 2 into 10 raise to power 8 metre per second find the refractive index of glass

Answer 1

Let the refractive index of glass be 'n'.

Speed of light in air = 3*10^8
Speed of light in glass = 2*10^8

The refractive index = Speed of light in air/speed of light in any medium (glass)

n = c/v
n = 3*10^8/2*10^8
n = 3/2. ..... Answer

Therefore the refractive index of glass is 3/2.

Hope this helps you....:)

Answer 2

1.5 is the correct answer
refractive index=speed of light in vacuum÷speed of light in glass
=3×10⁸÷2×10⁸
=3÷2=1.5