Question

what is convex lens and state it uses

Answer 1

☺convex lens is a lens which is the thicker at the centre and thinner at its edge .

uses:-
☺it is used to focus a big object in the small screen .

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Answer 2

A convex lens is like that of a magnifying glass that collectors use to look more closely at specimens. Convex lenses are referred to as converging lenses because they bend light toward a focal point whereas concave(diverging lenses) bend light away from a focal point.

Uses - Most high quality cameras, telescopes and binoculars use concave lenses to improve the quality of the images they provide. Microscopes and reflecting telescopes make use of a concave mirror, a plane mirror, and a convex lens, while refracting telescopes use two convex lenses.