KCET2007PhysicsRay Optics
A ray of light is travelling from glass to air. (refractive index of glass =1.5 ). The angle of incidence is 50^ . The deviation of the ray is
Options
- A0^
- B80^
- C50^ - ⁻¹ [ 50^ 1.5 ]
- D⁻¹ [ 50^ 1.5 ]-50^
Correct answer
B. 80^
Step-by-step solution
Refractive index, ^ a _ g =1.5 C=42^ Critical angle for glass =42^ When the angle of incidence in the denser medium is greater than the critical angle, reflection takes place inside the denser medium. Hence, a ray of light incident at 50^ in glass medium undergoes total internal reflection. Deviation ( )=180^ - (50^ +50^ ) (from the-figure) or =80^