A compound microscope uses a 72.0mm lens as the objective and a 2.1cm lens as th

ID: 1273010 • Letter: A

Question

A compound microscope uses a 72.0mm lens as the objective and a 2.1cm lens as the eyepiece. The specimen will be mounted 102mm from the objective.

Part A

Determine the barrel length.

Express your answer using two significant figures.

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Part B

Determine the total magnification produced by the microscope.

Express your answer using two significant figures.

A compound microscope uses a 72.0mm lens as the objective and a 2.1cm lens as the eyepiece. The specimen will be mounted 102mm from the objective.

Part A

Determine the barrel length.

Express your answer using two significant figures.

L = m

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Part B

Determine the total magnification produced by the microscope.

Express your answer using two significant figures.

Mtotal =

Part A)

Start with 1/f = 1/p + 1/q for the objective

1/7.2 = 1/10.2 + 1/q

q = 24.48 cm

Thus the barrel Length = 24.48 - 7.2 = 17.28 cm

That is 17 cm using two sig figs

Part B)

M = -25L/(fo)(fe)

M = -25(17.28)/(7.2)(2.1)

M = -29 using two sig figs (Ignore the Negative if your answer key wants you to. It just means the image is inverted)

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