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angle of deviation = angle of prism x ( refractice index -1)
The term angle of deviation is used in reference to a prism.
360
The angle between the incident ray and reflected ray is known as angle of deviation due to reflection. This will always be equal to 2i. Here i is the angle of incidence. So if 2i = 90 then i = 90/2 = 45 So the angle of incidence has to be 45 deg
it means at a very sharp angle or relating to a mountain side