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Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt
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Why do we say that light travels in straight lines Is it

Chapter 18, Problem 10E

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QUESTION:

Why do we say that light travels in straight lines? Is it strictly accurate to say that a laser beam provides a perfectly straight line for purposes of surveying? Explain.

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QUESTION:

Why do we say that light travels in straight lines? Is it strictly accurate to say that a laser beam provides a perfectly straight line for purposes of surveying? Explain.

ANSWER:

ANSWER: STEP 1:- It’s very non scientific to tell that light travels in a straight line. We know from the laws of optics that when light changes it’s travelling medium it gets bent. The speed of light also changes according to the different mediums it travels through. So, there is no ambiguity that light does not travel in a straight line. But the real problem is, whether a light ray can be deflected while travelling through empty space by gravity! If you are considering Newtonian gravity, then the answer is no. light

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