A Compound Microscope Has a 18-Cm-Long Barrel and an Objective

question 57

Multiple Choice

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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