What word describes a microscope that remains in focus when the objective lenses are changed?

Answer;

-Parfocal

Parfocal is the word that describes a microscope that remains in focus when the objective lenses are changed.

Explanation;

Parfocal means that when one objective lens is in focus, then the other objectives will also be in focus.

Parfocalling compound microscope objectives is a procedure which allows one to adjust each objective lens so that it will remain in relative focus with the other objective lenses on the microscope when switching from one magnifcation to the next.

Answer

Parfocal word describes a microscope that remains in focus when the objective lenses are changed.

Explanation:

The parfocal lens remains focus when the magnification objectives lenses are changed, without changing the focus of the instrument.

Thus Parfocal is a word describes a microscope that remains in focus when the objective lenses are changed.