Question

The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. The dispersive power of the material is......... [KCET 2004]
A) 0.0615 B) 0.024 C) 0.031 D) 1.60

Answer 1

Ans is option A) 0.0615
Because dispersive power is the ratio of angular dispersion to deviation of yellow

Answer 2

Answer:

The dispersive power of the material is 0.0615.

A is correct.

Explanation:

Given that,

The refractive index of a particular material is for

Blue = 1.67

Yellow = 1.65

Red = 1.63

The Dispersive power is the ratio of the angular dispersion and mean deviation.

The formula of the dispersive power is given as:

$\omega=\dfrac{\mu_{b}-\mu_{r}}{\mu_{y}-1}$

$\omega=\dfrac{1.67-1.63}{1.65-1}$

$\omega=0.0615$

Hence, The dispersive power of the material is 0.0615.