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Hi there,

i am a first year microbiology student and couldn't give you the most in depth answer, but...most microscopes have four different objective magnification lenses; 4x, 10x, 40x and 100x.

High and dry is referring to your 40x objective lense, because it's the highest magnification you can look through a microscope before you should put oil on your slide. Putting oil over your slide at 40x or lower simply blurs your scope vision whilst placing a drop of oil at 100x increases the amount of light and resolution you see due to the affects of refraction. It makes your view clearer.

I hope that helps.

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13y ago
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Q: What does high-dry mean on a microscope?
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