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The answer depends on the ratio of what characteristic you want.

Ratios of interest are between any two linear measures, or all three;

the surface area to volume,

mass to volume (density),

speed of light in air (vacuum) and the prism material (refractive index); and so on.

In the first two examples above, the shape of the prism is relevant, in the second two, the material that it is made of will matter.

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10y ago

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