Frequency pf rotating mirror (n) = 750 rev/s,
Deviation of the beam after reflection from the rotating mirror (2θ) = 3.6°,
Distance between two mirrors (d) = 1 km = 1000 m
Velocity of the light (c) = ?
We have the relation for the velocity of light as
∴ c = 3 x 10^8 m/s
Hence, the velocity of light (c) is equal to 3 x 10^8 m/s