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A laser impinges on a thin film (n = 2) sandwiched by two materials (n₁

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter37: Reflection And Images Formed By Reflection

Section: Chapter Questions

Problem 18PQ

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Question

30..

A laser impinges on a thin
film (n = 2) sandwiched by two materials
(n₁ <nf < n₂). The top material (₁) is
relatively thick. The laser can take on wavelength
Ao values from 500 [nm] to 2000 [nm]. Within
this range, constructive interference occurs only
for two wavelength values, 500 [nm] and another
wavelength. The respective orders of the
wavelengths do not differ by more than one. How
thick is the thin film? [Hint: First determine the
constraints on the order corresponding to
Xo = 500 [nm].]
n₁
nf
M₂

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