A ray of light AO in vacuum is incident on a glass slab at angle 60Â° and refracted at angle 30Â° along OB as shown in the figure. The optical path length of light ray from A to B is:

Question

2a + 2b/$\sqrt 3$

2a + 2b/3

2a + 2b

2$\sqrt3$/a + 2b

Solution

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