Physics
The phenomenon used to transmit a light signal over a wide range in optical fibre is:
- reflection
- refraction
- reflection and refraction
- total internal reflection
Refraction Plane Surfaces
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Answer
total internal reflection
Reason — Total internal reflection is the phenomenon used to transmit a light signal over a wide range in optical fibers. When light enters the optical fiber at an angle greater than the critical angle, it undergoes total internal reflection, effectively bouncing off the interface of the optical fibre. This allows the light signal to propagate along the length of the fiber without significant loss of intensity
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Related Questions
In the figure given below, the ray PQ emerging from the object P is refracted along QS. The angle PQN is known as:
- angle of deviation
- angle of refraction
- critical angle
- none of the above
The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. The ray PQ would:
![The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles.] ICSE 2019 Physics Solved Question Paper.](https://cdn1.knowledgeboat.com/img/abp10/5/icse-2019-physics-question-paper-solved-2e-1200x730.png)
- pass undeviated
- suffer refraction
- suffer reflection
- suffer total internal reflection
In the process of total internal reflection, …………… of energy (or intensity) of light is reflected back.
- 70%
- 80%
- 100%
- 50%
Out of violet, blue, yellow and red, the critical angle would be the least for …………… light for a pair of media.
- violet
- blue
- blue
- yellow