Question

Why should you not look down the microscope all the time as you try to focus the specimen?

Answer 1

Reason:

• While you look down the microscope, it racks the lens away from the slide.
• And stops when something comes into focus.  
• This is what you are meant to be seeing, but it could be dust on the bottom of the slide or the top of the cover slip.
• The dust can also be on the condenser lenses on the light bulb.  
• The best way to focus is to use only the fine focusing adjustment.

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