If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be:

Question

If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be: (A) 0.4 (B) 1.33 (C) 0.2 (D) 0.1

Tardigrade Admin · Accepted Answer

Dispersive power of material ω =(n upsilon -nr/ny-1) =(1.62-1.42/1.5)=1.33

Q. If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be:

0.4

1.33

0.2

0.1

Dispersive power of material $ω = \frac{n _{υ} - n _{r}}{n _{y} - 1}$ $= \frac{1.62 - 1.42}{1.5} = 1.33$

Q. If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be:

0.4

1.33

0.2

0.1

Dispersive power of material ω=ny​−1nυ​−nr​​ =1.51.62−1.42​=1.33

Dispersive power of material $ω = \frac{n _{υ} - n _{r}}{n _{y} - 1}$ $= \frac{1.62 - 1.42}{1.5} = 1.33$