F4 Bio 關於光學顯微鏡問題...

my answer is based on the model answer of my school :)
1. Actually, to catch the focus. The whole process is :First of all, we need to turn on the light soure and adjust the condenser and diaphragm until the lgiht is sufficient. Select the low power maginification. Clip the microslide on the stage and move the specimen to the centre. Watch the stage at eye level. Upper the stage until the objective nearly touches the cover slip. ++++++++++Slowly raise the body tube by using the coarse adjustment konb for focusing. ++++++++ Focus with the the find adjustment knob.

the part with +++++++++ is the main point of the answer.


2. There are 2 reasons in which we cannot use coarse adjustment knob for observing under high magnification.
-When we are using high power objective, the distance between the objective and slide is very small,- while the degree of movement of the stage moved by the coarse adjestment knob. Thus, the coarse adjustment knob will easily damage the objective and the slide.

- are the points state.



Hope I can help you :)