A ray undergoes a minimum deviation at 40o when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism
-
A.
1.48 -
B.
1.50 -
C.
1.53 -
D.
1.67
Correct Answer: Option C
Explanation
n = (frac{sin frac{1}{2} (dm + A)}{sin frac{1}{2} A})
= (frac{sin frac{1}{2} (40 + 60)}{sin frac{1}{2} times 60})
= 1.532