What's The Difference Between Convex And Concave Lens?

You can have convex and concave mirrors and lenses both.
A concave lens/mirror moves inwards and you see the object smaller. The outer part is thick and the inner part is thin and it is curved. (you can remember it by the word cave behind con, The lens or mirror moves in like a cave moves in)
And the convex lens/mirror moves outward and you can see the object or reflection larger.The outer part of the lens is thin and the center is thick(it is curved)

Concave lenses reflect light rays outwards.  The image through a concave lens will always be right side up.

  Convex lenses, on the other hand, refract light rays in toward a central point. When  the lens is held closer t

A convex lens bends inwards and a concave lens bends outwards.

Convex lens forms both real & virtual image, while concave lens always forms virtual image.
Convex lens magnifies the image,while concave lens diminish the image.

The concave lens always refract's outward's

The convex lens always refract's light in toward's the center point

Convex lenses r used 2 recover short sightedness?

The difference between concave and convex is

Convex like a earth
concave is opposite earth