A Physics Student Epoxies Two Converging Lenses to the Opposite

A physics student epoxies two converging lenses to the opposite ends of a 20-cm long tube.One lens has a focal length of f₁ = 4.0 cm.She wants to use this device as a microscope.If the desired magnification of this homemade microscope is 80,what focal length should the student use for the the second lens?

A) 1.67 cm
B) 1.42 cm
C) 1.56 cm
D) 2.00 cm
E) 1.75 cm

Correct Answer:

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