| A ray of light AO in vacuum is incident on a glass slab at angle \[60{}^\circ \] and refracted at angle \[30{}^\circ \] along OB as shown in the figure. The optical path length of light ray from A to B is: [JEE Main 10-4-2019 Morning] |
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A) \[2a+2b\]
B) \[2a+\frac{2b}{3}\]
C) \[\frac{2\sqrt{3}}{a}+2b\]
D) \[2a+\frac{2b}{\sqrt{3}}\]
Correct Answer: A
Solution :
[a] From Snell's law  |
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Optical path |
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