# physics

A ray of light traveling in air strikes the surface of a liquid.
If the angle of incidence is 33.5◦
and the
angle of refraction is 19.8◦, ﬁnd the critical
angle for light traveling from the liquid back
into the air.

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1. find n.

sin33.5=n*sin19.8

then, critical angle= arcsin n

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bobpursley
2. do I put my calculator in degrees?

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3. yes, I would.

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bobpursley
4. I keep getting error

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5. sinr1/sinr2 = n2/n1,
n1 = 1.003 (for air)
n2 = n1•( sinr1/sinr2) = 1.6244
sinr(o) = 1/n2 = 0.6156
r(o) – arcsin(0.6156) = 38 degr.

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6. i dont know

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