A Physics Student Epoxies Two Converging Lenses to the Opposite

A physics student epoxies two converging lenses to the opposite ends of a tube.One lens has a focal length of f₁ = 4.0 cm and the other has a focal length of f₂ = 2.0 cm.She wants to use this device as a microscope.If the desired magnification of this homemade microscope is 80,what length should the student use for the tube?

A) 25.6 cm
B) 20.0 cm
C) 18.1 cm
D) 32.6 cm
E) 28.5 cm

Correct Answer:

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