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A glass prism of refractive index 1.5 is immersed in water (refractive index 4/3). A light beam incident normally on the face AB is totally reflected to reach on the face BC if |
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Answer» `SIN theta ge 8/9` At POINT P, glass is denser and water is rarer . `""^gmu_w=(""^amu_w)/(""^amu_g)=(4//3)/(3//2)=8/9` `THEREFORE` From the theory of total internal reflection , sin `i_C=8/9` where `i_C`= critical angle `therefore theta = i_C` or sin `theta`=8/9 for critical angle. 
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