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92 Figure 35-56a shows two light rays that are initially in phase as they travel upward through a block of plastic, with wavelength 400 nm as measured in air. Light ray r, exits directly into air. However, before light ray r, exits into air, it travels through a liquid in a hollow cylinder within the plastic. Initially the height Lúq of the liquid is 40.0 um, but then the liquid begins to evaporate. Let o be the phase difference between rays r, and r, once they both exit into the air. Figure 35-56b shows versus the liquid's height Lig until the liquid disappears, with o given in terms of wavelength and the horizontal scale set by L, = 40.00 µm. What are (a) the index of refraction of the plastic and (b) the index of refraction of the liquid? 60 L'ia 20 - Plastic L, Liq (um) (a) (6) (Y) ¢

92 Figure 35-56a shows two light rays that are initially in phase as they travel upward through a block of plastic, with wavelength 400 nm as measured in air. Light ray r, exits directly into air. However, before light ray r, exits into air, it travels through a liquid in a hollow cylinder within the plastic. Initially the height Lúq of the liquid is 40.0 um, but then the liquid begins to evaporate. Let o be the phase difference between rays r, and r, once they both exit into the air. Figure 35-56b shows versus the liquid's height Lig until the liquid disappears, with o given in terms of wavelength and the horizontal scale set by L, = 40.00 µm. What are (a) the index of refraction of the plastic and (b) the index of refraction of the liquid? 60 L'ia 20 - Plastic L, Liq (um) (a) (6) (Y) ¢

University Physics Volume 3
University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter3: Interference
Section: Chapter Questions
Problem 91CP: A film of oil on water will appear dark when it is very thin, because the path length difference...
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92 Figure 35-56a shows two light rays that are initially in phase as they travel upward through a block of plastic, with wavelength 400 nm as measured in air. Light ray r, exits directly into air. However, before light ray r, exits into air, it travels through a liquid in a hollow cylinder within the plastic. Initially the height Lúq of the liquid is 40.0 um, but then the liquid begins to evaporate. Let o be the phase difference between rays r, and r, once they both exit into the air. Figure 35-56b shows versus the liquid's height Lig until the liquid disappears, with o given in terms of wavelength and the horizontal scale set by L, = 40.00 µm. What are (a) the index of refraction of the plastic and (b) the index of refraction of the liquid? 60 L'ia 20 - Plastic L, Liq (um) (a) (6) (Y) ¢
Transcribed Image Text:92 Figure 35-56a shows two light rays that are initially in phase as they travel upward through a block of plastic, with wavelength 400 nm as measured in air. Light ray r, exits directly into air. However, before light ray r, exits into air, it travels through a liquid in a hollow cylinder within the plastic. Initially the height Lúq of the liquid is 40.0 um, but then the liquid begins to evaporate. Let o be the phase difference between rays r, and r, once they both exit into the air. Figure 35-56b shows versus the liquid's height Lig until the liquid disappears, with o given in terms of wavelength and the horizontal scale set by L, = 40.00 µm. What are (a) the index of refraction of the plastic and (b) the index of refraction of the liquid? 60 L'ia 20 - Plastic L, Liq (um) (a) (6) (Y) ¢
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