i derived the formula for the critical angle of a medium? Is it correct?
Asked by prakamya | 9th Jan, 2010, 02:30: PM
Answer is correct. But please check the derivation given below, since it's not n1/n2 but n2/n1.
ni = Refractive index of medium i with respect to air or vaccum = Speed of light in air/Speed in Medium i
n1sinθi = n2sinθr
For critical angle of medium, θr = 90
n1sinθi = n2
sinθi = n2/n1
If you have to find the critical angle for a medium say Diamond and into air.
n1 = 2.42
n2 = 1
sinθi = 1/2.42
θi = sin-1(1/2.42) = 24o
Answered by | 9th Jan, 2010, 02:48: PM
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