Question

NTSE Sample Question Physics The critical angle of liquid is 300. Its refractive Index will be
(a) 4
(b) 2
(c) 3
(d) 0.5
Ans. (b) r = 1/ Sin C, Here C = 300.
So r = 1 / Sin 30

Answer 1

the ans is b option ie refractive index is 2

Answer 2

Answer is (b)

u = 1/sin300

i.e.

u = 1/sin60°

u = 2