Hihttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w08_qp_1.pdf
Auestion 1
How to solve this kind of questions ??
What we need to know is that...Total magnification= eyepiece x objective.
So for
A 50,B 100,C 200,D 400.
Obviously you know that greatest magnification you will see less cells.
So least maginification greatest number of cells,here is in A.Therefore answer is A.