A) \[{{o}^{0}}\]
B) \[{{80}^{0}}\]
C) \[{{50}^{0}}-{{\sin }^{-1}}\left[ \frac{\sin {{50}^{0}}\,}{1.5} \right]\]
D) \[{{\sin }^{-1}}\left[ \frac{sin{{50}^{0}}\,}{1.5} \right]-{{50}^{0}}\]
Correct Answer: B
Solution :
Refractive index, \[_{a}{{\mu }_{g}}=1.5\] \[\frac{1}{\sin C}=1.5\] \[\Rightarrow \] \[C=42{}^\circ \] 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\[(\delta )=180{}^\circ -(50{}^\circ +50{}^\circ )\] (from the figure) or \[\delta =80{}^\circ \]You need to login to perform this action.
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