Question

A ray of light strikes a plane water-air interface from within the water at an angle of incidence i. Which one of the following statements is corredt?

• A. If $i$ is $90^\circ$, the angle of refraction will be the critical angle
• B. If$i$ is equal to the critical angle, the reflected and refracted rays will be at right angles to each other
• C. If $i$ is less than the critical angle, all the light is refracted and the angle of refraction is greater than $i$
• D. If $i$ is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle

Answer 1

Answer: (D)

If $i$ is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle

Answer 2

Answer (d) If $i$ is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle