Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60° ). In the position of minimum deviation, the angle of refraction will be

Question

Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60° ). In the position of minimum deviation, the angle of refraction will be (A) 30° for both the colours (B) greater for the violet colour (C) greater for the red colour (D) equal but not 30° for both the colours

Tardigrade Admin · Accepted Answer

At minimum deviation for any wavelength r 1= r 2= A / 2, Because r 1+ r 2= A

Q. Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is $6 0^{\circ}$ ). In the position of minimum deviation, the angle of refraction will be

$3 0^{\circ}$ for both the colours

greater for the violet colour

greater for the red colour

equal but not $3 0^{\circ}$ for both the colours

At minimum deviation for any wavelength
$r_{1} = r_{2} = A /2,$
Because $r_{1} + r_{2} = A$

Q. Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60∘ ). In the position of minimum deviation, the angle of refraction will be

30∘ for both the colours