A spacer is cut from a playing card of thickness 2.82 ✕ 10−4 m and used to separate one end of two rectangular, optically flat, 3.10 cm long glass plates with n = 1.65, as in the figure below. Laser light at 594 nm shines straight down on the top plate. Two plates lie one on top of the other. They touch each other at the right end, and are separated by a small circle at the left end. Three arrows point vertically downward toward the top plate. (a) Count the number of phase reversals for the interfering waves. (b) Calculate the separation (in m) between dark interference bands observed on the top plate. m

A spacer is cut from a playing card of thickness 2.82 ✕ 10−4 m and used to separate one end of two rectangular, optically flat, 3.10 cm long glass plates with n = 1.65, as in the figure below. Laser light at 594 nm shines straight down on the top plate. Two plates lie one on top of the other. They touch each other at the right end, and are separated by a small circle at the left end. Three arrows point vertically downward toward the top plate. (a) Count the number of phase reversals for the interfering waves. (b) Calculate the separation (in m) between dark interference bands observed on the top plate. m

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter25: Reflection And Refraction Of Light

Section: Chapter Questions

Problem 62P

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Question

A spacer is cut from a playing card of thickness 2.82 ✕ 10⁻⁴ m and used to separate one end of two rectangular, optically flat, 3.10 cm long glass plates with n = 1.65, as in the figure below. Laser light at 594 nm shines straight down on the top plate.

Two plates lie one on top of the other. They touch each other at the right end, and are separated by a small circle at the left end. Three arrows point vertically downward toward the top plate.

(a) Count the number of phase reversals for the interfering waves.

(b) Calculate the separation (in m) between dark interference bands observed on the top plate.

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