Trace the path of ray (P) of light passing through the glass prism as shown in the figure. The prism is made of glass with critical angle $i = 40^{o}$

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Solution

From the figure, the incident ray is normal to the surface of prism. So, incident angle $= 0^{\circ}$ Then, angle of refraction will be zero. It means that the ray of light will pass through the prism undeviated, reaches the other end of prism. The second angle of incident $= 45^{\circ}$ (greater than critical angle of prism). The ray of light undergoes the phenomenon of total internal reflection and continues in the same manner.

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Trace the path of ray (P) of light passing through the glass prism as shown in the figure. The prism is made of glass with critical angle i=40o

Trace the path of ray (P) of light passing through the glass prism as shown in the figure. The prism is made of glass with critical angle $i = 40^{o}$