One of the mysteries of the English language finally explained.
1The angle formed by notional lines from the extremities of an object to the eye, or by lines from the eyes to a given point.
The angle between the optic axes of a biaxial doubly refracting crystal.
- ‘However, it was identified by Kile and Modreski as phlogopite; the optic angle was recently determined to be 16.7 degrees at a wavelength of 589.’
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