GCSE questions on refraction and TIR

Q10.

(a) Here is a diagram of an optical fibre.

(i) What is the name given to the dotted line on the diagram?

[1 mark]

(ii) Where the ray of light touches the edge of the optical fibre it is reflected.

Draw the reflected ray onto the diagram.

[2 marks]

(b) Optical fibres need to be able to bend around corners without breaking.

Suggest the property that optical fibres must have to allow them to bend around corners.

[1 mark]

(Total 4 marks)