A thin film of oil (no = 1.5) with varying thickness floats on water (n = 1.33). When it is illuminated from above by white light, the reflected colors are as shown in the figure. In air, the wavelength of yellow light is Ayellow = 580 nm. Dark (1) Why are there no reflected colors at point A? (2) What is the oil's thickness at point B? Blue Yellow Red anig Yellow B Air Oil no = 1.5 Water nw=1.33

A thin film of oil (no = 1.5) with varying thickness floats on water (n = 1.33). When it is illuminated from above by white light, the reflected colors are as shown in the figure. In air, the wavelength of yellow light is Ayellow = 580 nm. Dark (1) Why are there no reflected colors at point A? (2) What is the oil's thickness at point B? Blue Yellow Red anig Yellow B Air Oil no = 1.5 Water nw=1.33