Unit 2: Waves. Light and Color.

Transmission: the passing of light through matter

Pg 581-585

Unit 2: Waves. Visible Light. Transparent: when visible light is easily

transmitted through matter

Unit 2: Waves. Visible Light. Translucent: when visible light is transmitted but scattered when passing through matter

This usually results in a blurred effect.

Unit 2: Waves. Visible Light. Opaque: when visible light is NOT transmitted

through matter

You cannot see through opaque materials.

Unit 2: Waves. Visible Light. Quick Review: Which is

transparent, translucent, and opaque?

Unit 2: Waves. Visible Light.

Unit 2: Waves. Visible Light. Color. Colors of transparent or

translucent objects: You see the colors of

light that are transmitted through the

object.

Colors of opaque objects: You see only the color of the

white light that is transmitted through the

object. The rest of the colors are absorbed by the object.

Unit 2: Waves. Visible Light. Color.

White: All visible light – all of the colors of are

reflected.

Black: Absence of light – all of the colors of are

absorbed.

http://phet.colorado.edu/en/simulation/color-vision

Unit 2: Waves. Visible Light. Color.

Pigment: give paint color by reflecting some colors of light and absorbing others.

http://www.ux1.eiu.edu/~cfadd/1160/Ch23RR/Sub.html

Unit 2: Waves. Visible Light. Color.

Color addition: When colors of light are

combined to form a new color, more wavelengths

are present.

Color subtraction: Mixing colored

pigments causes more light to be absorbed, or

subtracted.

Unit 2: Waves. Visible Light. Mirrors & Lenses.

Plane Mirror: —Flat surface —Reflection is upright & same size —Virtual image

Ex: bathroom mirror, locker mirror

Concave Mirror: —Curved inward —Reflection can be upside down or upright —Virtual or real image

Ex: inside of spoon, flashlights

Pg 599-604

Unit 2: Waves. Visible Light. Mirrors & Lenses.

Convex Mirror: —Curved outward —Reflection is upright & small —Virtual image

Ex: back of spoon, passenger side mirror in car

Comparison of Mirrors

Unit 2: Waves. Visible Light. Mirrors & Lenses.

Concave Lens: —Curved inward —Thinner in the middle —Light bends away from each other

Convex Lens: —Curved outward —Thicker in the middle —Light refracts toward the center

Unit 2: Waves. Visible Light. Mirrors & Lenses. Convergence vs. Divergence of Light Waves:

Converge—coming together Diverge—move apart Ex: inside of spoon, car headlights, flashlights

http://www.qldscienceteachers.com/junior-science/physics/light-and-optics