2) A microscope has an objective lens with f = 16.22 mm and an eyepiece with f = 9.0 mm. With the length of
the microscope’s barrel set at 29.0 cm, the diameter of an erythrocyte’s image subtends an angle of 14.3
mrad with the eye. If the final image distance is 28.5 cm from the eyepiece, what is the actual diameter of
the erythrocyte?Hint: Start with the size of the final image then use the thin-lens formula for each lens to
find their combined magnification. Use this magnification to calculate the object size in the final step.
final unit for the solution Âµm
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