The units are wrong. d is the distance (in metres) from each lens to the cogwheel (not the distance separating). X is in rps not rpm. The required speed of light is in m/s not km/s.
The Goldbach Conjecture
System of equations
Angle between Two Vectors
Volume of a sphere given its surface area
Number of problems
Which way to go?
length of string on cylinder
rectangle in circle
Number of divisors of a given number
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