1.A beam of light enters water at an angle of 60 degrees relative to the normal of the water surface . Find the angle of refraction?
2.Light passes from air into water . If the angle of refraction is 20° ,what is the index of refraction of the plastic?
1.
"\\beta=\\arcsin\\frac{\\sin\\alpha}n=40.5\u00b0."
2.
"n=\\frac 1{\\sin\\beta}=2.9."
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