Question

The refractive indices of violet and red light are 1.54 and 1.52 respectively. If the angle of the prism is $ 10{}^\circ $ , the angular dispersion is

• A. $ 0.02{}^\circ $
• B. $ 0.2{}^\circ $
• C. $ 3.06{}^\circ $
• D. $ 30.6{}^\circ $

Answer 1

Answer: (B)

Given, $ {{\mu }_{V}}=1.54, $ $ {{\mu }_{R}}=1.52, $ $ A={{10}^{o}} $ Angular dispersion $ (\theta )=({{\mu }_{V}}-{{\mu }_{R}})A $ $ =(1.54-1.52)\times {{10}^{o}} $ $ ={{0.2}^{o}} $