How does critical angle relate to refractive index of a material?Explain.
Asked by ashwati | 10th Apr, 2009, 12:58: PM
We know that, refractive index = sin i / sin r
Now, let us consider a ray of light incident at an angle ic ( critical angle) from glass to air, for which the angle of refraction is 900.
So, the refractive index of air w.r.t. glass = sin ic / sin 900.
but, sin 900 = 1
so, the refractive index of air w.r.t. glass = sin ic / 1
or, the refractive index of glass w.r.t air = 1/ sin ic
so, knowing the refractive index of the denser medium w.r.t. rarer medium ,
we can calculate the critical angle for that pair of media or vice-versa.
Answered by | 12th Apr, 2009, 01:05: PM
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