Are glasses convex or concave?

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Solution

Explanation:
Glasses can be either convex or concave.
Concave lenses are used in the correction of nearsightedness(myopia).
People with nearsightedness have a problem seeing objects at a distance clearly.
Convex lenses are used in the correction of farsightedness(hypermetropia).
Farsightedness is a condition in which the person has a problem seeing close-by objects clearly.
There is also bifocal glass available which is a combination of concave and convex lenses.

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