Question

In: Physics

A) The medium-power objective lens in a laboratory microscope has a focal length fobjective = 4.00...

A) The medium-power objective lens in a laboratory microscope has a focal length fobjective = 4.00 mm . If this lens produces a lateral magnification of -37.0, what is its "working distance"; that is, what is the distance from the object to the objective lens B) What is the focal length of an eyepiece lens that will provide an overall magnification of -115? Assume student's near-point distance is N = 25 cm.

Expert Solution

PART A For the objective lens,

Lateral Magnification is -37.0

, where u is distance of object and v is distance of image from the objective lens.

Equation of lens is

Here,

, taking into account the sign conventions for u and real image formed at v.

The working distance of the microscope is 4.11 mm.

PART B :

Overall magnification M is given by

Here,

Since the image is to be formed at the near point of the student's eye, which is 25 cm,

Focal length of eyepiece lens is 8 cm.

genius_generous answered 2 years ago

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