You would use a convex lens.
convex lens
Convex Lens
They use optics
Convex lens because i said so
Convex lens because i said so
Concave
Convex lense
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The type of lense is a convex lense
The best type of material to use to prevent scratches on your lens is a nonabrasive cotton. You can also use a lens cloth to cover it. If you re use your cloth and need to clean it, do NOT use fabric softener when drying it.
You would use a microscope