1. use low power first
2. using coarse focus and looking at side of microscope wind down until you are as close as possible to the specimen slide
3. now looking in the eye piece and still using coarse wid up until you can see image
4. use fine focus to make sharp
5. to go up power turn the objective lens, only use fine focus now do not touch the coarse focus knob.
(NB you may need oil on the slide depending on your high power objective lens)
2. using coarse focus and looking at side of microscope wind down until you are as close as possible to the specimen slide
3. now looking in the eye piece and still using coarse wid up until you can see image
4. use fine focus to make sharp
5. to go up power turn the objective lens, only use fine focus now do not touch the coarse focus knob.
(NB you may need oil on the slide depending on your high power objective lens)