How to manipulate low power objective lens to focus a specimen

How is the low power objective lens manipulated to focus a specimen for observation under a light microscope.(3marks)

 



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Click the low power objective lens into position; bring it down to the lowest level using the course adjustment knob; with the eyes on the eyepiece; and using course adjustment knob gradually raise or lower the low power objective lens to bring the specimen into focus;

 

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