Q. 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 reflected ray
B) Only a reflected ray and no reflected ray
C) A reflected ray and a refracted ray and the angle between then would be less than $108{^\circ}\ - \ 2\theta$
D) A reflected ray and a refracted ray and the angle between then would be greater than $108{^\circ}\ - \ 2\theta$
Explanation
(c) Since$\ \theta < \ \theta_{C}$, both reflection and refraction will take place. From the figure we can see that angle between reflected and refracted rays $\alpha$is less than$\ 180{^\circ} - 2\theta$.
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.