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 .........

• A. 0.0615
• B. 0.024
• C. 0.031
• D. 1.6

Answer 1

Answer: (A)

0.0615

Answer 2

$\omega=\frac{\mu_{ v }-\mu_{ r }}{\mu_{ y }-1}=\frac{1.67-1.63}{1.65-1}=0.615$