Light of wavelength 647 nm is incident perpendicularly on a soap film (with n = 1.35) suspended in air. What are the smallest two thicknesses of the film for which the reflections from the film undergo fully constructive interference? 239 479 x nm (smallest) x nm (next smallest)

Light of wavelength 647 nm is incident perpendicularly on a soap film (with n = 1.35) suspended in air. What are the smallest two thicknesses of the film for which the reflections from the film undergo fully constructive interference? 239 479 x nm (smallest) x nm (next smallest)

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

Chapter27: Wave Optics

Section: Chapter Questions

Problem 6P

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Concept explainers

Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.

Question

Light of wavelength 647 nm is incident perpendicularly on a soap film (withn =
1.35) suspended in air. What are the smallest two thicknesses of the film for which the reflections from the film undergo fully constructive
interference?
239
X nm (smallest)
479
nm (next smallest)

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