At what angle from the normal would total internal reflection occur between oil
ID: 1502719 • Letter: A
Question
At what angle from the normal would total internal reflection occur between oil n = 1.3 and water n = 1.4? 31 degree 54 degree 68 degree Total internal reflection would occur for glass and water if the light was: In the oil In the water In either the oil or the water The next two questions are about the following situation; Blue light(lambda = 475 nm in air) travels from air (n = 1) into a thin plastic film (n = 1.4), which is on top of a thick glass plate (n = 1.5). Find t, the minimum (non-zero) thickness of the film, which gives destructive interference. T = 85 nm t = 107 nm t = 169 nm t = 367 nm t = 637 nm Find t, the minimum (non-zero) thickness of the film, which gives constructive interference. T = 83 nm t = 107 nm t = 170 nm t = 367 nm t = 637 nm A light beam travels from point x in water, n = 1.5 to point y in plastic, n = 1.4 Which picture above best represents the path taken by the light? A B C D EExplanation / Answer
11) angle = sin-1(1.3/1.4) = 68o
12) in the water
15) D
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