Ophthalmic Optics第 16 / 100 题
The index of refraction of a material is a ratio comparing what?
a.Speed of light in a vacuum to speed of light in the material
b.Front curve to back curve
c.Diameter to thickness
d.Weight to volume
解析
Index of refraction (n) equals the speed of light in a vacuum divided by the speed of light in the material. A higher index means light slows more, allowing thinner lenses for a given power.
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