Question

What is dispersive power write its formula in terms of refractive index?

Answer 1

The answers of the given questions are as follows -

• Dispersive power : Dispersive power can be defined as the ability (power) of a transparent medium to disperse (refract) the light rays.
• We can write the formula of dispersive power in terms of refractive index, by taking the example of a glass prism.

Let, μ₁ = Refractive index of violet rays

μ₂ = Refractive index of red rays

μ₃= Refractive index of yellow rays

So,

Dispersive power (ω) = (μ₂ - μ₁)/(μ₃ -1)

[Here, all the terms in the RHS are different values of different refractive index.]

Hence, we have written the formula of dispersive power in terms of refractive index.