Angular magnification of the eye piece for image at 25 cm
`=(1+(D)/(f))=1+(25)/(2.5)=11`
for objective, `u=-0.9cm, f=0.8cm`
`(1)/(upsilon)-(1)/(u)=(1)/(f)`
`(1)/(upsilon)=(1)/(0.8)-(1)/(0.9)=(9-8)/(7.2)=(1)/(7.2)`
`rArr upsilon =7.2cm.`
for eye piece, `upsilon = -25cm, f_(0)=25cm`
Again `(1)/(upsilon)-(1)/(u)=(1)/(f)`
`(-1)/(u)=(1)/(f)-(1)/(v)=(1)/(2.5)-(1)/(-25)=(11)/(25)`
`u=-(25)/(11)=-2.27cm`
`therefore` Distance between objective and eye piece
`=v+|u|=7.2+2.27=9.47cm`
Magnifying power of microscope
`=(7.2)/(0.9)xx(-25)/((-25)/(1))=88`