Calculate the critical angle for a glass to water interface (refractive index of water and glass are 3/4 and 4/3 respectively)
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You're given air-to-glass is 3/2 which can be written:
aRg = 3/2; similarly aRw = 4/3 which also means wRa=3/4
wRg (the target) = wRa x aRg = 3/4 x 3/2 = 9/8
We know SinC = 1/R
so C = ArcSin(1/R) = ArcSin(8/9)
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