260CHAPTER 22 22.56±±²³²´µ¶µ·±¸±²³³³±µ¶¹±µ²cº²²³²¸±²²³²¹±²²³²»±²²³²´±´²³²±´²³²¹´²³²¸The angle of refraction as the light enters the left end of the slab is ( )11121.00 sin50.0sinsinsin31.21.48airslabnnθ−−°===°(Observe from the figure that the first reflection occurs at x= d, the second reflection is at x= 3d, the third is at x= 5d, and so forth. In general, the
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