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Q. A flat sheet of crown glass has a thickness of 1.8 cm. It is on top of a flat sheet of diamond that has a thickness of 1.7 cm. Light strikes the crown glass perpendicularly and travels through it and then through the diamond. In the time it takes the light to travel through the two sheets, how far would it have traveled in a vacuum?

Q. A paperweight is made of a solid glass hemisphere with index of refraction 1.50. The radius of the circular cross section is 4.0cm. The hemisphere is placed on its flat surface, with the centre directly over a 2.5mm long line drawn on a sheet of paper. What lenght of line is seen by someone looking vertically down on the hemisphere?

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