Homework Help: physics

Posted by alessandra on Wednesday, December 5, 2012 at 12:54pm.

4. A beam of light in water enters a plastic block (index of refraction=1.40(a) if the angle of incidence is 40, what is the angle of refraction in the plastic?(b) at what angle must the beam be incident on the plastic if the refraction angle is to be 30?

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