Optics Ques 119
- Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is $60^{\circ}$ ). In the position of minimum deviation, the angle of refraction will be
(2008, 3M)
(a) $30^{\circ}$ for both the colours
(b) greater for the violet colour
(c) greater for the red colour
(d) equal but not $30^{\circ}$ for both the colours
Show Answer
Answer:
Correct Answer: 119.(a)
Solution:
Formula:
- At minimum deviation $\left(\delta=\delta _m\right)$ :
$ r _1=r _2=\frac{A}{2}=\frac{60^{\circ}}{2}=30^{\circ} \quad \text { (For both colours) } $
BETA
