7. Light rays can undergo reflection and refraction. Both of these can occur when light is travelling from a denser medium, such as glass, to a less dense medium, such as air.
(i) Explain the underlined terms.
(ii) Give a practical application of the reflection of light. (iii) State the laws of reflection of light.
(12) (3) (9)
(iv) Explain, with the aid of a diagram, how total internal reflection can occur.
(9)
(v) What is meant by the ‘critical angle’ in total internal reflection? (6)
The photo shows an optical fibre, which is used for the transmission of data using light waves.
(vi) Draw a diagram to show how light waves travel along an optical fibre.
(9)
(vii) Give two advantages of using optical fibres instead of copper wires when transmitting data.
(5)
(viii) Optical fibres are also used in medicine. Give an example of their use in medicine.
(3) 2005 air B i glass
7. Reflection and refraction can both occur to rays of light. What is meant by the reflection of light? State the laws of reflection of light.
The diagram shows a ray of light travelling from glass to air. At B the ray of light undergoes refraction. Explain what is meant by refraction.
(15)
Describe an experiment to demonstrate one of the laws of reflection of light.
