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When does the ray not change direction when it enters a plastic block from air? and why?

physics
 May 18, 2015

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When it enters at right-angles to the surface.  The sine of the angle of refraction is proportional to the sine of the angle of incidence, so if the angle of incidence is zero, so too is the angle of refraction.

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 May 18, 2015

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 #1
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When it enters at right-angles to the surface.  The sine of the angle of refraction is proportional to the sine of the angle of incidence, so if the angle of incidence is zero, so too is the angle of refraction.

. 

Alan May 18, 2015

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