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A ray of light AO in vacuum is incident on a glass slab at angle 60° and refracted at angle 30° along OB as shown in the figure. The optical path length of light ray from A to B is :(A) 2a + (2b/√3)(B) 2a + (2b/3)(C) (2√3/a) + 2b(D) 2a + 2b |
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