What are the uses of concave and convex lenses?

Both concave and convex lenses are used in glasses; A microscope, like a reflecting telescope, uses a concave mirror, a plane mirror, and a convex lens; A refracting telescope uses two convex lenses...

They use convex lenses because they need to focus the light IN to the eye. Convex focuses in while concave spreads the light out. So, they use convex lenses.

No. Convex lens bulge outward, and concave lenses go in ward. Convex lenses focus light, and concave lenses spread light out.

Glasses and a peep hole you find in your door

Convex mirrors are used in the rear view mirror of cars because they give an erect and virtual image of the traffic behind. They let us see a wider view of the traffic. Concave mirrors are used by...