KCET2008PhysicsRay Optics
A ray of light enters from a rarer to a denser medium. The angle of incidence is Then the reflected and refracted rays are mutually perpendicular to each other. The critical angle for the pair of media is
Options
- A⁻¹( i )
- B⁻¹( i )
- C⁻¹( i )
- D⁻¹( i )
Correct answer
C. ⁻¹( i )
Step-by-step solution
From law of reflection, i = r and r ^ i = _ d _ r From the figure r^ = (90^ -i ) From Eq. (ii) (90^ -i ) i = _ d _ r or i i = _ d _ r i = _ d _ r But _ d _ r = C (where is critical angle) i = C C = ⁻¹( i )