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3.2.2. Refraction of light
A subsection of Physics, 5054, through 3. Waves
Listing 10 of 64 questions
Optical fibres are used to transmit telephone signals. shows a ray of light that strikes the inside surface of an optical fibre at P. P State one advantage of using optical fibres to transmit telephone signals. On , draw a normal at P and mark the angle of incidence with the letter i. State and explain what happens to the ray at P. Use the term critical angle in your answer. The optical fibre is made of glass of refractive index 1.5. At the start of the optical fibre, the ray enters the glass from air. The angle of incidence in the air is 60°. Calculate the angle of refraction in the glass. angle =
5054_s12_qp_22
THEORY
2012
Paper 2, Variant 2
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10 A student traces the path of a ray of blue light as it enters and as it leaves a glass prism. shows the trace obtained by the student. A B blue light C On , draw and label, at the point B, the normal, the angle of incidence i and the angle of refraction r. State, in terms of the properties of light waves, why the light refracts at B. The angle of incidence for the ray of blue light at B is 45°. The refractive index of the glass is 1.5. Calculate the angle of refraction at B. angle of refraction = The student performs another experiment with a ray of red light along the line AB. On , show the path taken by this ray of light as it passes through and leaves the prism. The student performs another experiment with a semicircular glass block and a ray of white light. shows the path taken by this ray of light as it enters the glass at P until it hits the straight edge at Q. P white light semicircular glass block Q Ƨ The student finds that there is no change in direction as the ray enters the glass at P and that no light passes out of the glass at Q. Explain why the ray does not change direction at P. Explain why no light passes out of the glass at Q. On , draw the complete path followed by this ray. The student directs the ray of white light into the glass along different paths, so that the angle θ is slowly reduced. Describe what happens to the ray at Q.
5054_s13_qp_22
THEORY
2013
Paper 2, Variant 2
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Questions Discovered
64