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When I placed a lamp next to a mirror where I can see "two lamps", does that double the light output? I know all the light that would have been wasted on the wall is now being returned so is it a yes? (lemmy.dbzer0.com)

submitted 9 months ago by Melatonin@lemmy.dbzer0.com to c/asklemmy@lemmy.ml

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[–] diverging@lemmy.ml 3 points 9 months ago* (last edited 9 months ago)

the mirror is reflecting the light emitted by the lamp better than a wall will do.

Will it? Maybe. You are making the assumption that specular reflection is better at reflecting than diffuse reflection, but that is a false assumption. It depends on the reflectivity of the wall and the mirror. A white wall can reflect more light than a mirror.