Explain the reason for each of the following:
a) If you are trying to see a faint star in the night sky, it is better to look slightly to one side of it rather than straight at it. (think of the cells you are using)
b) Why is it easier to study an object in detail if you look straight at it? (think of the cells)
c) Why does the eye pupil dilate (i.e. widen) in dim light?