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A good-quality mirror is said to reflect what fraction of the light that falls on it?
AAll of the light, with no losses at all
BAbout half of the light that falls on it
CMore than 90 percent of the light that falls on it
DLess than 50 percent of the light that falls on it
Answer & Solution
Correct answer: C. More than 90 percent of the light that falls on it
1. A good-quality mirror reflects more than 90 percent of the light that falls on it.
2. The remainder is absorbed by the mirror rather than reflected.
3. This is why total internal reflection is valuable: it can reflect essentially all of the light, unlike an ordinary mirror.
_Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.2 Refraction_
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