What is concave lens and convex lens?

Concave Lens (Diverging Lens):- Curves inward like a cave- Thinner at the center and thicker at the edges- Diverges light rays spreading them apart- Forms virtual, upright, and diminished images- Used for myopia (nearsightedness) correction- Examples: peephole doors, some eyeglassesConvex Lens (Converging Lens):- Curves outward like a hill- Thicker at the center and thinner at the edges- Converges light rays bringing them together- Can form real or virtual images depending on object position- Used for hyperopia (farsightedness) correction- Examples: magnifying glasses, camera lenses, human eyeBoth lenses work by refracting (bending) light due to their curved surfaces, but in opposite ways.