Critical Angle

Asked by RACHIT_MAHAAN | 1st Jan, 2010, 02:43: PM

Expert Answer:


The critical angle is the angle of incidence above which total internal reflection occurs.

Total internal reflection is an optical phenomenon that occurs when a ray of light strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface, and gets completely reflected into the same medium than refracted into another medium.

Refractive Index = Speed of light in Reference medium/Speed of light in given medium.

So when we specify the Reference medium, the symbol n should explicitly show it.

2n1 = Refractive index of second medium with respect to first = Spee of light in first medium/Speed of light in second medium.

When the reference medium is vacuum, we just denote,

n2 or n1

Now it's easy to see that n21 or 2n1 = n2/n1 = (c/v2)/(c/v1) = v1/v2




Answered by  | 1st Jan, 2010, 04:14: PM

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