Solve it n please don't send too small pics of answer.
Q.10. A micro-organism, when viewed under a compound microscope with an objective lens of 40 X and an eye piece of 10 X magnification measured 4000 $\mu$ in length. The same micro-organism when observed under a dissection microscope with a lens of 10 X magnification, would measure ............
1) 100 $\mu$
2) 40 $\mu$
3) 400 $\mu$
4) 10 $\mu$

Dear student

Please refer the solution below for the said query


The correct option is (1).


 A 10X eyepiece and 40X objective lens will produce a magnification of 400X. Hence. the microorganism viewed under 400X measures 4000μ. 

Therefore microorganism viewed under 1X will be measured 4000/400=10μ 

Hence, a microorganism viewed under 10X will be measured 10 x 10 = 100μ 

Hope this information clears your doubt about the topic.

Regards