Question

what does it mean to have parfocal objectives? a) the sample remains in focus when the stage is moved laterally b) focusing on the sample is done automatically c) the whole sample is in focus d) the sample remains in focus when the objectives are changed

Explanation:

Parfocal objectives mean that when the objectives of a microscope are changed, the sample remains in focus without major re - focusing. This is a key feature for ease of use in microscopy.

Answer:

d) The sample remains in focus when the objectives are changed