Step 1:
We are given the following information:
Pupil diameter, $D = 4 mm = 4 \times 10^{-3} m$
Wavelength of light, $\lambda = 500 nm = 500 \times 10^{-9} m$
Minimum angular separation, $\theta_{min} = 1 mm / L$, where L is the distance to the ruler.
Show more…