. Light travels from air, through three media and back out into air as shown. If n>n>ns which of the following statements is not correct? Light in Light out Medium air 3 air Figure 28 A) A The speed of light before entering n; is the same as the speed of light leaving ns. B) Bn, 2, = n2 2, = n3 d, C) n 4, < n2 2, < ns d, D) 2, =1,<2,

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