Compound Microscope: the Focal Lengths of the Objective and the Eyepiece

question 104

Multiple Choice

Compound microscope: The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point) . The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope?

• A) -190 x
• B) -240 x
• C) -300 x
• D) -320 x
• E) -470 x

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