Question

Light travels form air to glass of reflactive index 1.5 then the critical angle is

Answer 1

◆As we can apply the Snell’s law,

n1/n2 = sin(r)/sin(i)

In case of critical angle,

r = 90 degrees

i = C = critical angle

and n1/n2 is the refractive index of the glass with respect to air. (i.e. 1.5)

Therefore,

1.5 = 1/sin(C)

C = sin^(-1)(1/1.5)

C = 41.81 degrees