Question

M2 M3
132. If a light ray falls on the square glass as
shown in the figure below making an angle of
incidence 45°: What must be the refractive index
of the glass if total reflection occurs at the
vertical face?
N
450
OP
​

Answer 1

Answer: 90 degrees is the angle of refraction.

Thank you.

Answer 2

where is the figure? 90°should be the correct answer