Question

How bright is a laser beam when viewed from the side?

Answer 1

Answer:

Any light beam viewed from the side has zero brightness. Only light that reaches the eye, camera, or other sensor, can have any brightness to it, so a beam (especially in a vacuum) is invisible from the side.

Explanation:

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Answer 2

Answer:

Any light beam viewed from the side has zero brightness. Only light that reaches the eye, camera, or other sensor, can have any brightness to it, so a beam (especially in a vacuum) is invisible from the side.