eli5: What is the difference between a mirror and a white object?

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I mean, what does a white object do? Absorbs nothing, reflects all light back.

What does a mirror do? Absorbs nothing, reflects all light back.

Having the same characteristics, how does a mirror reflect an image and a white object, a white texture?

In: Physics

18 Answers

Anonymous 0 Comments

Let’s say you have a horizontal light particles, all coming in to your mirror at the same angle, say 45° and all spread out 1 micro-meter apart. They will ALL hit the mirror and all bounce off at the same reflected angle (in this case 90° from their original angle) again spread 1 micro-meter apart.

If you took the same particles and sent them at say a white wall, they would NOT all bounce off at the same angle. That’s the difference.

Mirrors maintain angle of reflection, white surfaces don’t. At a small enough level a mirror is more “smooth” and a white surface more “rough”, hence the difference in behavior.

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