Parfocal refers to the idea that an image should maintain focus when shifted between distinct objectives. You should only make precise focus adjustments after the image is in focus.
<h3>Why is parfocal imaging crucial in microscopy?</h3>
Parfocal goals are those that can be modified with little to no focussing. It is convenient when the lenses stay in focus when you change the magnification on your microscope. When a microscope has named objectives, this is feasible.
The picture will stay in focus while switching from a lower-power objective to a higher-power objective because high-quality microscopes are parfocal. The oil reflects more light because it has the same refractive index as glass.
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