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)

n_{i} *• sine(Θ_{i}) = n_{r} • sine (Θ_{r})

n_{i} • sine(Θ_{crit}) = n_{r} • sine(90 degrees)

n_{i} • sine(Θ_{crit}) = n_{r}

sine(Θ_{crit}) = 1/1.51

Θ_{crit}=41.47 degree

is this the critical angle for light entering the prism?

Yes, it is critical ange.

It is the minimum angle for TIR.

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