FULL QUESTIONS Q5 Explain, with the aid of a labelled diagram, (i) total internal reflection, (ii) critical angle.
Describe an experiment to demonstrate these two concepts (total internal reflection and critical angle).
The telecommunications industry makes use of total internal reflection to carry signals through optical fibre. Draw a diagram to show how a ray of light is transmitted through an optical fibre.
How is the escape of light from the sides of an optical fibre prevented?
Give two reasons why the telecommunications industry uses optical fibres instead of copper conductors to transmit signals.
Name a material that is used in the manufacture of optical fibres. (12) (12)
(9) (6)
(6) (5)
Give two uses of total internal reflection other than the transmission of signals in the telecommunications industry. (6)
Q6 What is meant by the refraction of light? (6)
Fig 13.35 below shows the optical structure of the eye.What do the labels A, B, and C refer to? (9)
Explain the role played by each part A and B in bringing objects at different distances into focus. (9)
Why does this system not work properly under water? (6)
Describe the nature of the image formed on C. (6)
(iii)
(i) Calculate the power of the lens. (ii) Calculate the focal length of the lens. Name the type of lens used.
(iv) Name the defect.
Vitreous humour Ciliary muscle
Iris A
Pupil B
Aqueous humour Fig 13.35
The maximum power of a normal eye is 64 m1. A man has a specific defect with his sight resulting in his maximum power being 60 m–1.He wears contact lenses to correct this defect.
