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No, the closest we have gotten is 99.9% using special coatings like the ones on eyeglasses. These will only reflect specific wavelengths in a lab setting. In comparison the aluminum mirror in your bathroom will have between 85 -90% efficiency. (Even if you kept it completely clean) A high quality silver mirror can achieve 95% efficiency. The rest will either be absorbed by the metal or refracted by imperfections in the glass or metal.

It is theoretically not possible to create a 100 percent effective mirror due to the fact that visible light is a relatively wide spectrum that will behave differently at either end. (Blue light will be reflected slightly differently than red light etc.)

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Q: Do 100 percent reflective mirrors actually exist?
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