Which of the following is characteristic of an oil-immersion objective?
A. It has a low-power lens with a magnification factor of 10x.
B. It is used for specimens that need very high magnification.
C. Combined with the lens in the ocular, it has a total magnification factor of 500x.
D. There is an air space between the specimen under examination and the objective.
E. Condensed light passes through the specimen and the air space above the specimen.
Answer: B
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