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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 : 30° 60° Vacuum Glass B O a b A

1. 2a + 2b
2. b 2 a 3 2 +
3. 3 b 2 a 2 +
4. 3 b 2 a 2 +

Correct answer: 2a + 2b

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