Question

The refractive indices of three precious stones are given:

Ruby (1.71)

Sapphire (1.77)

Diamond (2.42).

Identify the stone in which the speed of light is maximum. ​

Answer 1

Explanation:

the speed of light will be more in ruby

Answer 2

From the given 3 stones in Ruby, the speed of light will be maximum.

• Here for every stone, the refractive index is given. We know that the refractive index of any medium or stone is known as the ratio of the speed of light and the speed at which light travels.
• The relation looks like,  n=$\frac{c}{v}$. Hence if the refractive index is higher than in that stone the speed of light is minimum.
• Among ruby, sapphire, and diamond the refractive index of Ruby is the lowest. Hence, the light speed will be maximum here.