Physics · Oct / Nov 2021 · Paper 42 · Question 7
0625
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Fig. 7.1 shows a ray of light approaching face AB of a glass prism of refractive index 1.5. ray of light B C A Fig. 7.1
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7(a)(i)[4]
i = 60° used or seen
sin i / sin r =n in any form
ray refracted toward normal and toward AC
ray clearly refracted down in prism reaching AC with r = 35(°)
7(a)(ii)[1]
10°
7(b)[1]
refracted away from normal
7(c)(i)[2]
(total internal) reflection at X
NOT refraction at X or anywhere else
reaches end of fibre with only one additional reflection (off lower internal edge of fibre)
7(c)(ii)[1]
total internal reflection
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