Physics (Essay) Paper 2 WASSCE (PC), 2018

Question 6

 

Is the intensity of light the same throughout the length of an optical fibre? Explain

 

Observation

 

This question was not popular among candidates. Most candidates avoided this question. few candidates who attempted performed woefully. Performance was low.

The expected answer is

Yes

In optical fibre, light is totally internally reflected. Consequently, the intensity remains the same.