Which of the following is a correct procedure for the operation of a microscope?
a.
use the fine focus knob with the low power lens and use the coarse focus knob with the high power lens.
b.
remove and add slides while the high power lens is selected.
c.
first, put the specimen into focus using a high power lens, then switch to a lower power lens, if needed.
d.
first, put the specimen into focus using a low power lens, then switch to a higher power lens, if needed.

D. First, put the specimen into focus using a low power lens, then switch to a higher power lens, if needed.

Explanation:

The microscope is a delicate and very useful and necessary instrument in a laboratory. For this reason, it must be used with care and responsibility so as not to compromise its operation.

To use a microscope it is necessary, first, that the sample to be observed is prepared. After that, you must turn on the device and place the sample in the appropriate place and try to focus the image using the low power objective lens. When the image is properly focused, you can use the high-power lens.