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abstraction > hypothesis > theory > law > optical law

optical law
subject			fact

optical law	has domain optics
	is a kind of law
law	has discoverer
theory	has validity correct or incorrect with caveats
	has author or reasearch group
	has date or a range of dates for which the theory was active

Kinds of optical law :

• Snell's law (2 facts) - For a refracted light beam, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. (also called the Law of Refraction)