Find the speed of light in the following. (a) sodium chloride (b) fused quartz (c) benzene
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- A spotlight is on the ground 20 ft away from a wall and a 6 ft tall person is walking towards the wall at a rate of 2.5 ft/sec. How fast is the height of the shadow changing when the person is 8 feet from the wall? (A) -2.0833 B) -0.5433 C) -0.4533 D) -2.0444Find the speed of light in the following. (a) diamond ______________m/s(b) fluorite ______________m/s(c) glycerine ______________m/sCalculate the index of refraction in a substance where the speed of light is 1.2x108m/s? The angle of incidence from air into a substance is 30°. The angle of refraction in the substance is 18°. What is the speed of light in the substance?