The compound (bright-field) microscope is parfocal. It means that:   Question 4 options:   objective lenses are built into revolving nosepiece   its lenses effectively decrease focal lenght   can achieve maximum resolution lower than 0.2 μm   image should remain in focus when objective lens is changed

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Microscopy

Microscopy is a technical field of study about the use of microscopes to observe small objects like cells and micro-organisms that are not visible to the naked eye. A microscope is used in the field of microscopy, in order to see the object or organism that cannot be seen easily. Microscopes help us to observe the fine structure of a cell and its content.