Lenses

Physics: Concave lenses and Convex lenses

By Lucy Wu

Open Ended

What do you know about concave and convex lenses?

Concave lenses

• A concave lens is thinner at its center than at its edges, and is used to correct shortsightedness

• A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it.

Convex Lenses

• A convex lens is also called a converging lens because it makes parallel light rays passing through it bend inward and meet (converge) at a spot just beyond the lens known as the focal point.

• A convex lens makes parallel light rays converge (come together) at the focal point or focus.

Poll

What have you learned today?

• Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses. The convex lenses are thicker at the center, as compared to its edges. The concave lenses are thinner at the center as compared to its edges.

• When light passes through a concave lens, the light rays bend so that they spread apart. Concave lenses make objects look smaller than they really are. A convex lens curves outward. It is thicker in the middle than at the edges.

Thank you!

By Lucy Wu

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