A thin film of oil no = 1.50 with varying thickness floats on water nw = 1.33.

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A thin film of oil no = 1.50 with varying thickness floats on water nw = 1.33. When it is illuminated from above by white light, the reflected colors are as shown in Fig. 24-60. In air, the wavelength of yellow light is 580 nm.

(a) Why are there no reflected colors at point A?

(b) What is the oil's thickness at point B?

Air Oil Dark no = 1.50 Water Nw = 1.33 Blue Yellow Red Blue Yellow
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