Biology Lab Microscope Magnification Calculations

[rmusial91]

Homework Statement

To examine a particular blood sample in biology lab, a student uses a compound microscope set to have a magnification of -4530. The objective and eyepiece are both attached to a tube which is 18 cm in length and the eyepiece has a focal length of 2.62 cm. The near point of the person using the microscope is 24 and you can assume she can view the image produced with a fully relaxed eye.

a) What is the focal length of the objective?

b) What is the distance between the blood sample and the objective lens?

Homework Equations

Mobjective = -di/do = - di/ fobjective

Meyepiece = N/feyepiece

Mtotal = Mobjective*Meyepiece

The Attempt at a Solution

i tried using these equations...but they didnt work out for me.. unless I am using the wrong equation... i got them equation from compound microscope section of a book

 

[robodobo33]

The equations you have are right; you just have to do some substitution. Starting with your most general/biggest one, Mtotal = Mobjective*Meyepiece, sub in the equations that you have for the Mobjective and Meyepiece. Then, plug in the values given by the problem. You will also need to remember that L(length) = fobjective + feyepiece where the f=focal length. Hope this helps! :)