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Optical transmission

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Substance properties index
Optical transmission diagram
calc
The optical properties of bulk substances is often quoted as "n" and "k" values, which are the real and imaginary parts of refractivity, respectively. "k" relates to optical absorption, and this calc determines the transmission of a sample.
k-value
thickness
wavelength

Gives opacity
or an OD of
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notes
It is important to know that the "k" values of substances are strongly wavelength-dependent, so it must be known for the specific wavelength of interest in order for the calculation to be accurate. k values range over several orders of magnitude, from 0.00001 (and less) for highly transparent materials to approaching 1 for very opaque materials.