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A ray of light is travelling from glass to air. (refractive index of glass $=1.5$ ). The angle of incidence is $50^{\circ}$. The deviation of the ray is
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Verified Answer
The correct answer is:
$80^{\circ}$
Refractive index, ${ }^{a} \mu_{g}=1.5$
$\Rightarrow \quad C=42^{\circ}$
Critical angle for glass $=42^{\circ}$
When the angle of incidence in the denser medium is greater than the critical angle, reflection takes place inside the denser medium.
Hence, a ray of light incident at $50^{\circ}$ in glass medium undergoes total internal reflection.
Deviation $(\delta)=180^{\circ}-\left(50^{\circ}+50^{\circ}\right)$
(from the-figure)
or
$$
\delta=80^{\circ}
$$
$\Rightarrow \quad C=42^{\circ}$
Critical angle for glass $=42^{\circ}$
When the angle of incidence in the denser medium is greater than the critical angle, reflection takes place inside the denser medium.
Hence, a ray of light incident at $50^{\circ}$ in glass medium undergoes total internal reflection.
Deviation $(\delta)=180^{\circ}-\left(50^{\circ}+50^{\circ}\right)$
(from the-figure)
or
$$
\delta=80^{\circ}
$$
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