Question

I have already answered question 1 which is below:

1) In the Landolt-C acuity test, the average threshold for accurately identifying the position of the gap in the C-like character was 0.75mm in size, at a distance of 3000mm.

What angle is subtended by the gap at this acuity threshold? Show your working and give your answer in Minutes of arc.

Distance = 3000mm

Size = 0.75mm

0.85944 Minutes of arc

However I don't quite understand how to work out question 3:

3) The angle subtended by stars in the night sky is orders of magnitude smaller than the acuity threshold you calculated in 1). Why are we able to see objects that are much smaller than the angle subtended by the gap in the acuity threshold experiment? (50 word max)

Answer 1