A ray of light is normally incident on the face PQ of a plastic prism with an index of refraction n=1.25 as shown in Figure 1. Determine the largest value of angle [tex]\theta[/tex] so that the ray is totally reflected at the face PR.(adsbygoogle = window.adsbygoogle || []).push({});

I just want to know whether the sum of the incidence and reflection angle must equal to right angle or not (for this diagram), does the ray of reflection must be perpendicular with the plane QR?

If that so, the maximum angle of [tex]\theta[/tex] is equal to the critical angle,right?

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# Homework Help: Determine the largest value of angle optics problem

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