1.

Magnification of a compound is 30. Focal length of eyepiece is 5 cm and the image is formed at a distance of distinct vision of 25 cm. The magnification of the objective lens is

Answer»

6
5
7.5
10

Solution :`m_(e)=(V)/(u)=(D)/(u_(c))=1+(D)/(f_e)=1+(25)/(5)=6`
for the compound microscope , `m = m_(o) xx m_(e) rArr = 30= m_(a) xx 6 (or) m_(o) = 5`


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