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# Why do we say that light travels in straight lines Is it ISBN: 9780321909107 29

## Solution for problem 10E Chapter 36

Conceptual Physics | 12th Edition

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Problem 10E

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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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 rays don’t bend towards heavier objects by their enormous gravitational attraction. The newtonian force law is, F = G m1m 2 ----------------(1) r2 Here the 1st mass is suppose the mass of a black hole and the 2nd mass is the mass of light, which is zero. So according...

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##### ISBN: 9780321909107

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