Draw a labelled diagram to show how light travels through an optical fibre. - Leaving Cert Physics - Question d - 2022

To illustrate how light travels through an optical fibre, draw the following components:

1. Core: Represent the central part of the optical fibre where light is transmitted. Label this part as 'Core'.

2. Cladding: Surrounding the core, draw another layer representing the cladding. This layer has a lower refractive index. Label it as 'Cladding'.

3. Light Path: Draw a beam of light entering the core at a certain angle. This should show how light is incident on the core-cladding interface.

4. Total Internal Reflection: At the boundary between the core and cladding, illustrate the light reflecting back into the core, showcasing total internal reflection. Indicate this with arrows to show the light path.

5. Labeling Angles: Optionally, label the incident angle and the angle of reflection to reflect the concept of angles in total internal reflection.

6. Additional components: You can also label the outer protective layer to indicate the full structure of the optical fibre if space permits.