Q. Two beams of red and violet colours are made to pass separately through a prism of $A = 60{^\circ}.$In the minimum deviation position, the angle of refraction inside the prism will be
A) Greater for red colour
B) Equal but not $30{^\circ}$for both the colours
C) Greater for violet colour
D) $30{^\circ}$for both the colours
Explanation
(d) Here, Angle of prism, $A = 60{^\circ}$
For minimum deviation, $A = 2r$
Or $r = \frac{A}{2} = \frac{60{^\circ}}{2} = 30{^\circ}$ for both colours
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.