Choose the one alternative that best completes the statement or answers the question. -A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm.

Choose the one alternative that best completes the statement or answers the question.
-A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm. What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for
Minimum eyestrain for persons with a near point of 25 cm.
A) 2.3 cm
B) 2.1 cm
C) 1.9 cm
D) 1.5 cm
E) 1.3 m

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