Physics (Essay) Paper 2 WASSCE (SC), 2021

Question 7

 

(a) State the scientific principle underlying the operation of fibre optics.
(b) Explain each of the following terms as used in fibre optics:
(i) core;
(ii) cladding.

 

Observation

 

Many candidates wereunable to answer the question correctly. Performance was fair

The expected answer is

(a)        Scientific Principle

Total Internal Reflection                   

(b)        Explanation of Terms

(i)         Core: The central/inner part of the optical fibre( that acts as the light carrying portion of the fibre)                                

(ii)        Cladding: The outer layer that surrounds the core (with lower refractive index)