I am not sure which category this best fits into so apologies in advance if it's not correct.
I am part way through a semester at uni and the subject is aimed at late high school/entry level knowledge but it has been years since I've looked at this. Would love you advice on a, b and c ? I
For a, I have a focal length of 4cm, what are others opinions?
For b, the S2 should be larger than f but I am not able to get a logical answer - I can only get an answer of 0.3999 or 3999/10000 = 1/S2 ..?
Hope to hear from you guys soon