Assignment:

Assume the sensor is in the z=0 plane and its width is arranged from -1 to 1 and it's height is between -(ny/nx) to (ny/nx). Emit photons uniformly from a sphere with radius 0.1 and with center (0,0,0.1) and a uniform spectrum E(lambda) = constant.

So for each photon:

1. pick a random location on the sphere
2. pick a random direction away from the sphere
3. pick a random wavelength
4. if the photon hits the sensor, do the same thing as in program 2

Results:

10k photons

1M photons

10M photons