COMEDK Exam 2019 Solved Paper

Given, refractive index for blue light, µb=1.67
Refractive index for yellow light, µy=1.65
Refractive index for red light, µr=1.63
Dispersive power, ω= ?
Dispersive power is the ratio of angular dispersion and mean deviation.
The formula of dispersive power is given as
ω‌=‌

µb−µr

µy−1

‌=‌

1.67−1.63

1.65−1

‌=‌

0.04

0.65

=0.0615