Question

The Refractive Index of Glass is 1.5. Calculate the Speed of Blue Light in Glass.

Answer 1

Refractive index of glass with respect to water = speed of light in air / speed of light in glass.

refractive index =1.5

1.5 = 3×10^8 / speed of light in glass.

speed of light in glass = 3 × 10^8 / 1.5.
= 2 x 10^8 m/s.

Answer 2

Answer:

The speed of blue light in glass will be 2×10⁸m/s.

Explanation:

The refractive index of the glass is given as,

$\mu=\frac{c}{v}$      (1)

Where,

μ=refractive index of glass

c=speed of light in the vacuum=3 ×10⁸m/s

v=speed of light in the glass

From the question we have,

μ=1.5

By substituting the value of μ and c in equation (1) we get;

$1.5=\frac{3\times 10^8}{v}$

$v=\frac{3\times 10^8}{1.5}=2\times 10^8m/s$

Hence, the speed of blue light in glass will be 2×10⁸m/s.