Unformatted text preview: Reflection and Refraction of Light 18. 235 The cross section can be visualized by considering just the two rays of light on the edges
of the beam. If the beam of light enters a new medium with a higher index of refraction,
the rays bend toward the normal, and the cross section of the refracted beam will be larger
than that of the incident beam as suggested by Fig. CQ22.18a. If the new index of
refraction is lower, the rays bend away from the normal, and the cross section of the beam
is reduced, as shown in Fig. CQ22.18b. 1 1 2 2 n2 > n1 n2 < n1 (b) (a) Figure CQ22.18 ...
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