Modulation transfer function

The optimal distance can vary depending on the strength of the magnifying glass, but typically it is best to hold it about 2-3 inches away from the object.

Lens MTFchart

A magnifying glass typically has a single convex lens, while a microscope has multiple lenses and a more complex system for magnifying objects.

MTFimage quality

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Yes, if used incorrectly or with improper safety precautions, a magnifying glass can cause eye strain or even start a fire if focused on flammable materials for too long.

Yes, a magnifying glass can make objects appear larger than they actually are by bending and magnifying the light rays that pass through it.