Question

A ray of light travelling in water is incident on its surface open to air. The angle of incidence is $\theta$, which is less than the critical angle. Then there will be

• A. only a reflected ray and no refracted ray
• B. only a refracted ray and no reflected ray
• C. a reflected ray and a refracted ray and the angle between them would be less than $180^\circ - 2 \theta$
• D. a reflected ray and a refracted ray and the angle between them would be greater than $180^\circ - 2 \theta$

Answer 1

Answer: (C)

a reflected ray and a refracted ray and the angle between them would be less than $180^\circ - 2 \theta$

Answer 2

Since, $\theta < \theta_c,$ both reflection and refraction will take place.
From the figure we can see that angle between reflected and
refracted rays a is less than $180^\circ - 2 \theta.$
$\therefore$ Option (c) is correct