7_Chapter 22 HomeworkCH22 Reflection and Refraction of Light

7_Chapter 22 HomeworkCH22 Reflection and Refraction of...

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Reflection and Refraction of Light 239 22.4 (a) The time for the light to travel to the stationary mirror and back is ( ) 3 4 8 2 35.0 10 m 2 2.33 10 s 3.00 10 m s d t c × ∆= = = × × At the lowest angular speed, the octagonal mirror will have rotated 1 in this time, so 8 rev min 4 18 rev 536 rev s 2.33 10 s t θ ω == = ∆× (b) At the next higher angular speed, the mirror will have rotated 28 rev in the elapsed time, or ( ) 3 2m i n 2 2 536 rev s 1.07 10 rev s ωω 22.5 (a) For the light beam to make it through both slots, the time for the light to travel
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