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| 1. |
A ring angled isosceles prism KLM of refractive index n_(1) is placed inside a rectangular block PQRS of refractive index n_(2) as shown in the adjoining Fig. The rectangular box is surrounded by a medium of refractive index n_(3). A ray of light AB enters the rectangular block normally. Depending upon the relationships between n_(1), n_(2) and n_(3). it takes one of the four possible paths. State the condition for light ray to travel along path no. 3 (i.e., path ABCGH). |
| Answer» Solution :The ray no. 3 goes STRAIGHT without UNDERGOING deviation at C. Hence we conclude that `n_(1)=n_(2)` and `n_(3)` may have any value. | |