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The lens that should you use to first look at a slide on a microscope is : A. Scanning lens
Compared to other lenses, scanning lens provide you with a wider view. It's perfect for first look to see the slide as a whole

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The lens that you should use to first look at a slide on a microscope are the scanning lens. The correct answer would be option A. Scanning lens should be first used so that you will have a wider field of view and you can get it to focus. 
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