General Science • PhysicsHard
A compound microscope consists of an objective lens and an eyepiece lens. If the focal length of the objective lens is denoted by f_o and that of the eyepiece by f_e, which of the following optical conditions is true for a normal operating compound microscope?
A. Both f_o and f_e are large and equal in magnitude
B. f_o is much greater than f_e
C. f_o is very small and f_e is slightly larger but still short✓ Correct Answer
D. f_o is large while f_e is extremely small
💡 Solution & Explanation
A compound microscope is designed to magnify very small nearby objects, requiring an objective lens with a very short focal length to form a real and magnified intermediate image, and an eyepiece with a short focal length to further magnify that image. If the focal lengths were large, the magnifying power would be inadequate for microscopic examination. Astronomical telescopes have a long focal length objective and a short focal length eyepiece. The magnification of an optical instrument is expressed in linear dimensions.
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