Q. For a medium, refractive indices for violet, red and yellow are known to be $1.62$ , $1.52$ and $1.55$ respectively. What will be the dispersive power of the medium ?
NTA AbhyasNTA Abhyas 2020
Solution:
The Dispersive power $\omega $ of a medium is given by :
$\omega =\frac{\mu _{v} - \mu _{r}}{\mu _{y} - 1}Substituting:\omega =\frac{1 . 62 - 1 . 52}{1 . 57 - 1}=\frac{. 1}{. 57}=0.18$
$\omega =\frac{\mu _{v} - \mu _{r}}{\mu _{y} - 1}Substituting:\omega =\frac{1 . 62 - 1 . 52}{1 . 57 - 1}=\frac{. 1}{. 57}=0.18$