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

question 90

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)1.3 m
• B)1.5 cm
• C)1.9 cm
• D)2.1 cm
• E)2.3 cm

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