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:

\(\frac{{2\sqrt 3 }}{{\rm{a}}} + 2{\rm{b}}\)

\(2a + \frac{{2{\rm{b}}}}{{\sqrt 3 }}\)

A ray of light AO in vacuum is incident on a glass slab at angle 60°

1.	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.	\(\frac{{2\sqrt 3 }}{{\rm{a}}} + 2{\rm{b}}\)
B.	\(2a + \frac{{2{\rm{b}}}}{3}\)
C.	\(2a + \frac{{2{\rm{b}}}}{{\sqrt 3 }}\)
D.	\({\rm{\;}}2a + 2{\rm{b}}\)
Answer» E.

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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:

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