Question: A ray of light falls on a rectangular glass block (n = 1.5) that is almost completely submerged in water (n = 1.33) as shown

A ray of light falls on a rectangular glass block (n = 1.5) that is almost completely submerged in water (n = 1.33) as shown in Figure.

(a) Find the angle θ for which total internal reflection just occurs at point P. 

(b) Would total internal reflection occur at point P for the value of θ found in part (a) if the water were removed? Explain.

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Water Glass

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