Physics · Oct / Nov 2020 · Paper 41 · Question 9
0625
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9(a)(i)[1]
wave / light / energy / ray is completely / entirely reflected (at the boundary between two mediums) or no refraction or no wave / light / energy / ray passes into second medium / across boundary or only reflection occurs
9(a)(ii)[2]
light (must pass) from medium where it travels slower or to medium where it is faster or from medium with larger refractive index or to medium with smaller refractive index
angle of incidence (must be) greater than the critical angle / sin–1(1 ÷ n)
9(b)[3]
light / infrared travels in fibre
total internal reflection at inner surface or within (graded-index) fibre
light carries information / signal / data / message or signal / light encoded
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