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| 1. |
A red ray and a violet ray passing through a glass slab are incident simultaneously on an interface with air. It is seen that the red ray is refracted but the violet ray is reflected. Explain the reason behind it. |
| Answer» Solution :The refractive INDEX of glass for red light is SMALLER than that of glass for violet light. Since the CRITICAL angle, `theta_(c) = sin^(-1)""(1)/(mu),` so the critical angle of glass for red light is compartively greater. So the angle at which the red and the violet rays are incident, is smaller than the critical angle of red light but greater than the critical angle of violet light. So the red light is refracted and the violet light is totally REFLECTED. | |