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Which of the following parts of a microscope controls the amount of light entering the specimen?
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5. Cell Components
Microscopes
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Which term describes a microscope that remains in focus when the objective lenses are changed?
A
Achromatic
B
Parfocal
C
Binocular
D
Monocular
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Understand the problem: The question is asking for the term that describes a microscope's ability to remain in focus when switching between objective lenses.
Review the concept of 'parfocal': A parfocal microscope is designed so that when you change from one objective lens to another, the image remains in focus or requires only minimal adjustment.
Eliminate incorrect options: 'Achromatic' refers to lenses that minimize chromatic aberration (color distortion), not focus retention. 'Binocular' and 'Monocular' describe the number of eyepieces on the microscope, not its focusing properties.
Identify the correct term: Based on the definition, the term 'parfocal' matches the description of a microscope that remains in focus when objective lenses are changed.
Conclude: The correct answer is 'Parfocal,' as it directly describes the feature of maintaining focus during lens changes.
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