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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
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a reflected ray and refracted ray and the angle between them would be less than $180^{\circ}-2 \theta$
a reflected ray and refracted ray and the angle between them would be less than $180^{\circ}-2 \theta$
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 $180^{\circ}-2 \theta$.
$\therefore$ Option (c) is correct.
$\therefore$ Option (c) is correct.
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