What are the three lowest angular speeds for which the wheel in Fizeaus apparatus (see Fig. 22.11)

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What are the three lowest angular speeds for which the wheel in  Fizeau’s apparatus (see Fig. 22.11) allows the reflected light to pass  through to the observer? Assume the distance between the notched wheel and the mirror is 8.6 km and that there are 5 notches in the  wheel.

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