Light Exploration

Write On Grade

Learner Expectation Content Standard: 14.0 Energy The student will investigate energy

and its uses. Learning Expectations: 14.1 Know that energy exists in

many forms. 14.2 Recognize the characteristics

of light energy and sound energy.

In this activity you will: Observe that light passes through

some materials easily,some materials partially, and some not at all.

Classify materials according to the way light passes through them.

Materials and Light There are three different types of

materials that light will or will not pass through.

Transparent Translucent Opaque

Transparent Light Materials that you can see through

allow almost all of the light to pass through.

Light is allowed through with very little bending or scattering of the rays of light.

Examples of Transparent Materials Clear glass Clean water Clear plastic

Question Why is transparent tape called

transparent tape?

Answer You can see through it or light rays

are allowed to pass through it.

I can completely see my leftovers wrapped in transparent plastic wrap.

Translucent Materials Materials that allow only some light to

pass through. Objects allow light to pass through, but

they scatter the rays so much that you cannot get a clear view of what is on the other side.

Examples of Translucent Materials Thin fabrics Frosted glass Thin paper

Question Why is wax paper translucent?

Answer You can see some light, but you

cannot see through it.

I can barely see my leftovers wrapped in wax paper.

Opaque Materials

Light cannot pass through these materials.

Examples of Opaque Materials

Brick Metal Thick paper Aluminum Foil Wood Stones

Quick Facts about Opaque Materials These objects will cast a shadow

when lit up. Brick, metal, and thick paper stop

light completely. This is why you cannot see your

leftovers wrapped in aluminum foil!

Writing Activity Write a paragraph that

includes a definition and example of transparent , translucent and opaque light.