CET Karnataka Medical
CET - Karnataka Medical Solved Paper-2007
question_answer
A ray of light is incident normally on one face of a right angled isosceles prism. It then grazes the hypotenuse. The refractive index of the material of the prism is
A) 1.33
B) 1.414
C) 1.5
D) 1.732
Correct Answer:
B
Solution :
Refractive index, \[\mu =\frac{1}{\sin C}\]where C is the critical angle. Here, \[C=45{}^\circ \] (as shown) \[\therefore \] \[\mu =\frac{1}{\sin {{45}^{o}}}\]or\[\mu =\sqrt{2}\]or\[\mu =1.414\]