Study the lens at your table:How is the lens shaped?

Look through the lens at the pages of a book, your hand, a hair, and other things.

Draw and label what you see in your science notebook.

How does this lens make things look?

Shine a flashlight on a piece of white paper. Draw what you see.

Shine a flashlight through the lens onto a piece of white paper. In what direction does this lens bend light?

Shine the flashlight through different combinations of lenses. What happens when you use multiple lenses at the same time?

Draw pictures of what you see in your science notebook.

What does focus mean?

How does that apply to the light going through the lens?

Make a scientific drawing of what happens when a light goes through this type of lens.

Light Rays Convex Lens

Focus Point

A Convex Lens…

has at least one surface that curves outward like the exterior of a sphere.

makes things look larger through them.

brings light rays to a point or focus(converge).

Normal VisionLight enters the eye and the convex lens of

the eye focuses the image on the back of the eye (retina).

Farsightedness occurs when the eye is too short or the eye’s cornea is flatter than normal.

This causes light rays to focus beyond the back of the eye (retina) creating blurry close-up vision.

Farsightedness and Convex Lenses

A convex lens makes objects look largerand farther away.Convex lenses correct farsightedness.

Part 2

Study the lens at your table:How is the lens shaped?

Look through the lens at the pages of a book, your hands, a hair, and other things.

Draw and label what you see in your science notebook.

How does this lens make things look?

Shine a flashlight on a piece of white paper. What do you see?

Shine a flashlight through the lens onto a piece of white paper. What do you see?

Shine the flashlight through different combinations of lenses. What happens when you use multiple lenses at the same time?

Draw pictures of what you see in your science notebook.

What does diverge mean?

How does that apply to the light going through the lens?

Make a scientific drawing of what is happening when light shines through this type of lens.

Light RaysConcave Lens

A Concave Lens…

is thicker on the edges than in the middle. seems to cave in toward the center and things look smaller through them. make light rays bend outward (diverge), spreading them across a surface.

Normal VisionLight enters the eye, and the convex lens of

the eye focuses the image on the back of the eye (retina).

Nearsightedness occurs when the eye is stretched and/or the cornea is overly curved.

This causes light rays to focus in front of the retina resulting in blurry distance vision.

A concave lens makes objects look smaller and closer.Concave lenses correct nearsightedness.

Nearsightedness and Concave Lenses

Review

Review

Do you know the answers to thesequestions about lenses or do you

need more Science lab time?