A) \[{{0}^{o}}\]
B) \[{{80}^{o}}\]
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, \[^{a}{{\mu }_{g}}=1.5\] \[\frac{1}{\sin C}=1.5\] \[\Rightarrow \] \[C={{42}^{o}}\] Critical angle for glass \[={{42}^{o}}\] 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 \[{{50}^{o}}\] in glass medium undergoes total internal reflection. Deviation \[(\delta )={{180}^{o}}-\text{(}{{50}^{o}}+{{50}^{o}}\text{)}\] (from the-figure) or \[\delta ={{80}^{o}}\]You need to login to perform this action.
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