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| Q.64 | The light output from a GaAs LED is coupled into a step index fiber with a numerical aperture of 0.2, a core refractive index of 1.4 and a diameter larger than the diameter of the device. So, the coupling efficiency into the fiber when the LED is in close proximity to the fiber core will be: | |
| Ans | 1. 12.22% | |
| 2. 4% | ||
| 3. 20% | ||
| 4. 40% |
Correct Ans Provided: 2
