what is critical angle?

Physics
Tutor: None Selected Time limit: 1 Day

what is crtitcal angle as light passes through air (n i=1.00) into a glass prism (n r=1.51) so that the light is not totally reflected internally? 

I used the equation:
n i * sin(theta i) = n r * sin(90)
(1.00)sin(theta i) = (1.51)(1)

May 6th, 2015

ni *• sine(Θi) = nr • sine (Θr)

ni • sine(Θcrit) = nr • sine(90 degrees)

ni • sine(Θcrit) = nr

sine(Θcrit) = 1/1.51

Θcrit=41.47 degree


May 6th, 2015

Yes, it is critical ange. 

It is the minimum angle for TIR.

May 6th, 2015

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