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In a classroom demonstration of thin films, your physics teacher takes a glass plate and places a thin layer of transparent oil on top of it. The oil film is then illuminated by shining a narrow beam of white light perpendicularly onto the oil's surface, as shown above. The indices of refraction of air, the oil, and the glass plate are given in the diagram. Standing near the light source, you observe that the film appears green. This corresponds to a wavelength of 520 nm in air.

In a classroom demonstration of thin films, your physics teacher takes a glass plate and places a thin layer of transparent oil on top of it. The oil film is then illuminated by shining a narrow beam of white light perpendicularly onto the oil's surface, as shown above. The indices of refraction of air, the oil, and the glass plate are given in the diagram. Standing near the light source, you observe that the film appears green. This corresponds to a wavelength of 520 nm in air.

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Air Oil Glass Light Source 2 C. na = 1.0 no = 1.4 ng= 1.5 1. In a classroom demonstration of thin films, your physics teacher takes a glass plate and places a thin layer of transparent oil on top of it. The oil film is then illuminated by shining a narrow beam of white light perpendicularly onto the oil's surface, as shown above. The indices of refraction of air, the oil, and the glass plate are given in the diagram. Standing near the light source, you observe that the film appears green. This corresponds to a wavelength of 520 nm in air. a. Calculate the minimum thickness of the oil film (other than zero) such that the observed green light is the most intense. b. If you move to the other side of the glass plate, so that you are looking towards the light source, will the film still appear green? Explain. As your teacher changes the angle of the light source, the light you observe from the film changes color. Give an explanation for this phenomenon. d. Would the same be observed if the index of refraction for the glass were 1.3 (everything else the same)? Explain.
Transcribed Image Text:Air Oil Glass Light Source 2 C. na = 1.0 no = 1.4 ng= 1.5 1. In a classroom demonstration of thin films, your physics teacher takes a glass plate and places a thin layer of transparent oil on top of it. The oil film is then illuminated by shining a narrow beam of white light perpendicularly onto the oil's surface, as shown above. The indices of refraction of air, the oil, and the glass plate are given in the diagram. Standing near the light source, you observe that the film appears green. This corresponds to a wavelength of 520 nm in air. a. Calculate the minimum thickness of the oil film (other than zero) such that the observed green light is the most intense. b. If you move to the other side of the glass plate, so that you are looking towards the light source, will the film still appear green? Explain. As your teacher changes the angle of the light source, the light you observe from the film changes color. Give an explanation for this phenomenon. d. Would the same be observed if the index of refraction for the glass were 1.3 (everything else the same)? Explain.
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