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  4. White light is incident on one of the refracting surfaces of a prism of angle 5°. If the refractive indices for red and blue colours are 1.641 and 1.659 respectively, the angular separation between these two colours when they emerge out of the prism is

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Q. White light is incident on one of the refracting surfaces of a prism of angle $5^\circ$. If the refractive indices for red and blue colours are $1.641$ and $1.659$ respectively, the angular separation between these two colours when they emerge out of the prism is

KCETKCET 2006Ray Optics and Optical Instruments

Solution:

Angular dispersion,
$\delta_{b}-\delta_{r} =\left(\mu_{b}-\mu_{r}\right) A$
$=(1.659-1.641) 5^{\circ} $
$=0.09^{\circ}$