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Q. No.Total internal reflection can take place only if:
| 1. | the light goes from optically rarer medium (smaller refractive index) to optically denser medium. |
| 2. | the light goes from optically denser medium to rarer medium. |
| 3. | the refractive indices of the two media are close to each other. |
| 4. | the refractive indices of the two media are widely different. |
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Subtopic: Â Total Internal Reflection |
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