The diagram below shows a light ray travelling through an optical fibre. The fibre is
made from two different glass materials known as the core glass and the outer
cladding glass. These two types of glass materials have different refractive indices.
7.1 State the TWO conditions necessary for total internal reflection to occur. (4)
7.2 Which part of the optical fibre will have a higher refractive index? Write down
only CORE or CLADDING. (1)
The refractive index of the core glass is 1,5.
7.3 Calculate the critical angle for the boundary between the two glass materials. (3)
7.4 State TWO advantages of optical fibre cables over copper cables when used
in telecommunication. (2)
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