What is a Refraction?
The change in direction of a ray of light when it passes through one media to another with differing optical densities.
U.S. Department of Energy
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08/04/2008
Test to determine an eye's refractive error and the best corrective lenses to be prescribed. Series of lenses in graded powers are presented to determine which provide sharpest, clearest vision.
I am an Optician.
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08/04/2008
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