There are two main types of lenses:• convex lenses—these curve outwards
and are fatter in the middle• concave lenses—these curve inwards
(a little like a cave) and are thinner in the middle.
Convex lenses Concave Lenses
There are 2 basic types of lenses
A converging lens (Convex)takes light rays and bringthem to a point.
A diverging lens (concave) takes light rays and spreads them outward.
Concave lens is thinner in the center than at the edges.
Light is refracted away from the center of the lens.
The light rays will never meet on the other side of the lens.
Concave LensesConcave Lenses
• Lenses that are Lenses that are thicker at the edges thicker at the edges and thinner in the and thinner in the center. center. – Diverges light rays
– All images are
erect and reduced.
The De-Magnifier
Concave LensesConcave Lenses
• Concave lenses Concave lenses produce only produce only virtualvirtual images. images.
Sample Example question
Convex lensesa. Diverge lightb. Converge lightc. Reflect lightd. Separate light into colors
Did you see how the images formed by lenses
Can you determine the focal point and the focal length.
Can you differentiate between the concave and convex lenses
Can you describe the properties of the images that are formed by lenses