Question

A prism whose angular dispersion is ${30}^o$ deviates light by ${60}^o$. The dispersive power of the prism is:

• A. $0.5$
• B. $0.05$
• C. $0.02$
• D. $0.2$

Answer 1

The correct option is A $0.5$

Truly speaking, dispersive power of a prism is defined as the ratio between the angular dispersion to the angle of deviation for yellow color. In this case $\omega =\frac{\theta }{{\delta }_y}=\frac{30}{60}=0.5$