The beam of light after the reflection at a plane mirror, rotating 2000 times per minute, passes to a distant reflector. it returns to the rotating mirror from which it is reflected to make an angle of 1° with its original direction. If the distance between the mirror is 6250 m, calculate the velocity of the light.
On a stormy day, a boy observes a lightning flash which is followed by thunder 3 sec later. How would you estimate the distance of the lightning strike from the boy? (Given velocity of sound on that day = 332 m/s, velocity of light c = 3x108 m/s)
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