When magnification can be changed without refocusing, the microscope objectives are said to be

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Multiple Choice

When magnification can be changed without refocusing, the microscope objectives are said to be

Explanation:
Parfocal optics are designed so that once you have the specimen focused at one objective, you can rotate to another objective and the image stays in focus, or is nearly in focus, with only a small amount of fine-tuning needed. This means magnification can be changed without needing to refocus from scratch, which speeds up observations and keeps the workflow smooth. The other terms refer to different qualities: paracentral means the field of view stays centered when you switch objectives, not about focusing; apochromatic refers to correcting color aberrations across wavelengths; plan indicates a flat field of view with minimal edge distortion.

Parfocal optics are designed so that once you have the specimen focused at one objective, you can rotate to another objective and the image stays in focus, or is nearly in focus, with only a small amount of fine-tuning needed. This means magnification can be changed without needing to refocus from scratch, which speeds up observations and keeps the workflow smooth. The other terms refer to different qualities: paracentral means the field of view stays centered when you switch objectives, not about focusing; apochromatic refers to correcting color aberrations across wavelengths; plan indicates a flat field of view with minimal edge distortion.

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