physics

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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.
Answer in units of◦

  • physics -

    find n.

    sin33.5=n*sin19.8

    then, critical angle= arcsin n

  • physics -

    do I put my calculator in degrees?

  • physics -

    yes, I would.

  • physics -

    I keep getting error

  • physics -

    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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