Help !!! AP Physics! LIGHT?

Light enters a slab of glass after which it travels into water. THe light is totally internally at the water-air interface.


a. critical angle?


b. angle the light makes w/ normal in the glass?


c. original angle of incidence the light makes at the air-glass interface?

Help !!! AP Physics! LIGHT?
a) dig out your snells law equation - angle of refraction is 90 (u'll have been given the n's for water %26amp; air n=1 -almost)





b) asuming interfaces are parallel then look at your 'Z' angles (critical angle at h2o-air will be same as refracted angle at glass-h2o). use snells law again (u'll be given n for glass %26amp; water)





c) same again with 'Z' angles and snells law -





are you sure you've looked over your notes hard enough or is this an easy option out after watching the footy prior to a deadline??
Reply:You need to use Snell's Law:





n1sin(theta)=n2sin(theta)





where theta is the angle of incidence of the light ray from the normal (perpendicular to the surface)





and 'n' is the index of refraction of the material





the index of refraction for your materials are:





water = 1.333


crown glass = 1.52 (I would use this one for your problem)


flint glass = 1.66


air = 1.000293 (you can use 1)





For total internal reflection, the critical ange is: sin(theta)=n2/n1





Figure this out first and then work back to find the rest.

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