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How much a material slows down light
n=ccsn = \frac{c}{c_s}n=csc
Approx. 1
n1sinθ1=n2sinθ2n_1 \sin \theta_1 = n_2 \sin \theta_2n1sinθ1=n2sinθ2
Entering more optically dense medium
sinθc=n2n1\sin \theta_c = \frac{n_2}{n_1}sinθc=n1n2 where n1>n2n_1 > n_2n1>n2
Angle of incidence > critical angle
Core has higher refractive index
Use narrower cores
Use monochromatic light
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