MHT CET202120 Sep 2021Evening ShiftPhysicsRay OpticsActual
A ray of light travels from a denser medium to a rarer medium. The reflected and the refracted rays are perpendicular to each other. If ' r ' and ' r ₁ ' are the angle of reflection and refraction respectively and ' C ' is the critical angle, then the angle of incidence is
Options
- A⁻¹( C )
- B⁻¹( C)
- C⁻¹( C)
- D⁻¹( C)
Correct answer
B. ⁻¹( C)
Step-by-step solution
Since reflected and refracted rays are perpendicular to each other, aligned & r+r₁=90^ & r₁=90^ -r aligned Refractive index of the denser medium aligned & = r₁ r = (90^ -r ) r = r r = r & Also, = 1 C 1 C = r & or C= r= i & i= ⁻¹( C) aligned