You know what it looks like… but what is it called?
TAKE THE QUIZ“Becke”
We have one entry that includes the term Becke.
Becke test
noun: a method of determining with a microscope the relative indices of refraction of a transparent particle (such as a plant or animal cell or a mineral) immersed in or in contact with a standard medium of known refractive index
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Merriam-Webster unabridged