Physics · May / June 2023 · Paper 42 · Question 7
0625
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The question as text
Fig. 7.1 shows a container of oil. x container oil Fig. 7.1 A ray of light shines on the surface of the oil. The refractive index of the oil is 1.47.
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7(a)[1]
normal drawn in correct position and at right angles to the surface
7(b)[3]
22°
i = 34(°)
n = sin i / sin r OR (r =) sin–1 {sin i / n} OR sin r = sin 34 / 1.47 OR sin r = 0.38
7(c)[1]
3.0 × 108 m / s
7(d)[2]
2.04 × 108 m / s
n = speed of light in air / speed of light in oil
OR (speed of light in oil =) speed of light in air / n
OR (speed of light in oil =) 3.0 × 108 / 1.47
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