How do we use lenses? Concave Lens is used: to correct myop | Ask Me

How do we use lenses?

Concave Lens is used:
to correct myopia eye defects
to make spectacles
in peepholes in hotel room doors.
in the construction of certain types of telescopes.

Convex Lens is used:
to correct hypermetropia eye defects
in cameras and digital cameras as optical devices for producing a reduced, true, and inverted image on film.
in microscopes and telescopes
to produce a magnified image of an object.

Subtypes of convex lens are:
A bi-convex lens is a basic lens that consists of two convex surfaces in a spherical form with the same radius of curvature.
Plano-convex lenses are positive focal length elements that have one spherical surface and one flat surface
ConConvex lenses are also known as converging lenses since the rays converge after falling on the convex lens.

Subtypes of concave lenses are:
A bi-concave lens have two inward curved surfaces. These lenses have a negative focal length.
A plano-concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length and can be used for light projection, beam expansion, or to increase the focal length of an optical system.
A concavo-convex lens is a converging lens. This is because it is thicker in the middle and thinner at the edges allowing it to converge all the light that is incident on it.

The lens of our eyes is also convex. The inverted image of the item on the retina is formed by the eye lens.

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