Suppose you have a lens system that is to be used primarily for 5380–nm infrared light. What is the second thinnest coating of fluorite (magnesium fluoride, refractive index n = 1.38) that would be non–reflective for this wavelength?

Suppose you have a lens system that is to be used primarily for 5380–nm infrared light. What is the second thinnest coating of fluorite (magnesium fluoride, refractive index n = 1.38) that would be non–reflective for this wavelength?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter3: Interference

Section: Chapter Questions

Problem 47P: To save money on making military aircraft invisible to radar, an inventor decides to coat them with...

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.

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Thickness condition for the thin film to be non-reflective.

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So, the 2nd minimum thickness for the coating to be non-reflective.

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