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I believe the explanation is entirely scientific.
There is no such object or mirror that reflects 100% light cast onto it, not matter how good it may be. A certain percentage of the light is absorbed by any part of the mirror.
Take a rearview mirror in a car, for example. There's actually two surfaces there, one mirror behind another. The first mirror is what's known as half silver, meaning it reflects 50% of the light cast onto it. A "full" mirror is behind it, so that you can click the mirror up to reduce glare from other headlights at night, but you lose some of the image, or light, when you do this. See what I mean?
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