Question

3. What are the uses of convex lenses and concave lenses​

Answer 1

Answer:- The convex lens is curved towards the inside. The concave lens is curved towards the outside. It is used to correct long-sightedness or hypermetropia. It is used to correct short-sightedness or myopia

Answer 2

Explanation:

What is a convex lens?

CONVEX or POSITIVE lenses will CONVERGE or FOCUS light and can form an IMAGE

Convex Lenses

What is a concave lens?

CONCAVE or NEGATIVE lenses will DIVERGE (spread out) light rays

Concave Lens

You can have mixed lens shapes too:

mixed lens shapes

See a demonstration (opens a new window) of what happens to the light path when you combine several convex or concave lenses.

convex and concave lenses, convex vs concave, combined lenses

Perfectly straight, until something bends it. The straight paths of light are called LIGHT RAYS.

Simple or Complex Lenses?

Simple or Complex?

Simple lenses can't form very sharp images, so lens designers or optical engineers figure out how to combine the simple types to make complex lenses that work better. We use special computer programs to help us do this because it can take BILLIONS and BILLIONS of calculations.

These two devices use these types of lenses. Can you guess what they are? (Click on it to see the answer.)

lenseslenses

Magnifying Glass: A Simple Optical Device

This diagram (click it to see a bigger version) shows how a magnifying glass bends light rays to make things look bigger than they are. Many optical devices use the same basic idea of bending the light to fool your eye and brain so light LOOKS like it came from a different (usually larger or closer) object.

lenses

[Click image to see a larger image]

See a cool Flash demonstration of simple magnification from the Molecular Expressions website (opens a new window, requires it to see

hope you like this anwer thnx