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Q. You would like to eliminate the reflected light from a flat glass pane for perpendicularly incident light of wavelength 675 nm. If the index of refraction of the glass is 1.50 and you have a coating material with an index of refraction of 1.30, what minimum thickness of coating material will have the desired effect?

Q. A non-uniform bar 5 meters has a center of gravity 1 meters from the heavy end. If it is placed on the edge of a block 1 meters from the light end and a weight of 1497 N is placed at the light end of the bar, it will be balanced. What is the weight of the bar?

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