In a Michelson experiment for measuring speed of light, the distance travelled by light between two reflections from the rotating mirror is 4.8 km. The rotating mirror has a shape of a regular octagon. At what minimum angular speed of the mirror (other than zero) the image is formed at the position where a non rotating mirror forms it ?
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A, C
In the given Michelson experiment `D=4.8km=4.8xx10^3m` We know `c=D(omegan)/(2pi)` `rarr w=(2pic)/(DN) rad/sec` `=c/(DN) rev/sec` ltbr. `=(3xx10^8)/((4.8xx10^3xx8)` `=(7.8)xx10^3 rev/sec`
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