Consider a light ray travelling in air is incident into a medium of refractive index $\sqrt{2n}$. The incident angle is twice that of refracting angle. Then, the angle of incidence will be :
Solution
<p>According to the law,</p>
<p>$$1 \times \sin \theta = \sqrt {2n} \times \sin \left( {{\theta \over 2}} \right)$$</p>
<p>$\Rightarrow \cos {\theta \over 2} = \sqrt {{n \over 2}}$</p>
<p>$\Rightarrow \theta = 2{\cos ^{ - 1}}\left( {\sqrt {{n \over 2}} } \right)$</p>
About this question
Subject: Physics · Chapter: Optics · Topic: Refraction and Snell's Law
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