Why must you never use the coarse adjustment knob to focus under high power?

Answer  the coarse focus with higher lenses may result in crashing the lens into the slide.

Explanation:

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one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.