Question

In an experiment with Foucault's apparatus, the various distances used are as follows :
Distance between the rotating and the fixed mirror= 16 m
Distance between the lens and the rotating mirror= 6 m,

Distance between the source and the lens = 2 m.
When the mirror is rotated at a speed of 356 revolutions per second, the image shifts by 0.7 mm. Calculate the speed of light from these data.

Answer 1

In the given Focault experiment,
R = Distance between fixed and rotating mirror = 16m