## Physics: Principles with Applications (7th Edition)

Published by Pearson

# Chapter 24 - The Wave Nature of Light - Questions: 7

#### Answer

The light sources are not coherent enough and are too far apart.

#### Work Step by Step

Car headlights are not coherent light sources, meaning that the phase relationship between the emitted light beams is randomly changing. Furthermore, the spacing d between the headlights is so large that the angle $\theta$ would be vanishingly small. The fringes would be far too close together to be resolved.

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