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1 The ratio of electromagnetic radiation reflected by a surface to that which is incident upon it.

2 In ore microscopy, the amount of incident polarized light which is reflected off the surface of an opaque mineral. The value of the percentage reflectance (R%) at a specified wavelength is a useful quantitative aid to mineral identification and is determined by: R% = (intensity of reflected light/intensity of incident light) × 100.

Subjects: Earth Sciences and Geography — Psychology.

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