(d)
Angular magnification of eye-piece is [(25/fe) + 1] ( fe in cm) which
increases if fe is smaller Further, magnification of the objective
is given by   
O
O
O
O
1
|
|
(|
|/
)
1
v
u
u
f
=
−
which is large when  
|O
u|
 is slightly greater than fO The micro-
scope is used for viewing very close object So 
|O
u|
 is small, and
so is fO