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

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Optical path length = O A + μOB = a c o s 60 o + μ b c o s 30 o = 2 a + μ 2 b 3 From Snell’s law, s i n 60 o = μ s i n 30 o μ = 3 Optical path length = 2 a + 3 2 b 3 = 2 a + b

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