Finding index of light refraction given a time delay through material

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A laser beam shines along the surface of a block of transparent material. (See the figure .) Half of the beam goes straight to a detector, while the other half travels through the block and then hits the detector. The time delay between the arrival of the two light beams at the detector is 6.50 {\rm ns}.

What is the index of refraction of this material?

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