Your task in physics laboratory is to make a microscope fromtwo lenses. One lens
ID: 1662654 • Letter: Y
Question
Your task in physics laboratory is to make a microscope fromtwo lenses. One lens has a focal length of 2.0 cm, the other1.0 cm. You plan to use the more powerful lens as theobjective, and you want the eyepiece to be 16 cm from theobjective. Part A: For viewing with a relaxed eye, how far should thesample be from the objective lens? Part B: What is the magnification of your microscope? I kno for Part B. M= -L/f obj * 25cm/f eye Your task in physics laboratory is to make a microscope fromtwo lenses. One lens has a focal length of 2.0 cm, the other1.0 cm. You plan to use the more powerful lens as theobjective, and you want the eyepiece to be 16 cm from theobjective. Part A: For viewing with a relaxed eye, how far should thesample be from the objective lens? Part B: What is the magnification of your microscope? I kno for Part B. M= -L/f obj * 25cm/f eyeExplanation / Answer
for viewing witha relaxed eye the microscope should be innormal adjustmentso that the final image is formed at the least distance of clearvision.
Ve (image distance from eyepiece)=-25 cm(sinceimage formed to the left of the lens)
Fe(focal length of the eyepiece)=+2 cm
using 1/V -1/U =1/F ---- (1)
1/Ue =-1/25-1/2=-0.54
Ue =-1.85cm(object distance from eyepiece)
Now,Vo +Ue =16cm(given)(length of thetube)
where Vo is the image distance from the objective.
Vo =16-1.85=14.15cm
Fo =1 cm(given)(focal length of the objective)
using the eqn. (1),
we get Uo =-1.07cm(object distance from theobjective)
so the object must be placed at a distance of 1.07 cm from theobjective lense.
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