Coach Dave Edinger J. C. Booth Middle School Physical Science (8A) Light Coach Dave Edinger J. C. Booth Middle School Physical Science (8A)

When light strikes an object, the light can be: Absorbed (taken, held in) Reflected (bounces back) Transmitted (passes through)

Opaque Definition: a material that REFLECTS or ABSORBS all of the light that strikes it You CANNOT see through the object Examples: wood, brick, cotton fabrics

Transparent Definition: A material that TRANSMITS light Light passes through allowing you to see what is on the other side Examples include: clear glass, water, air

Translucent Definition: A material that SCATTERS light as it passes through You can tell something is behind the object, but cannot see the details Examples include: frosted glass, wax paper

You see most objects because light is REFLECTED or BOUNCES, off them You see most objects because light is REFLECTED or BOUNCES, off them. What you see when you look at an object depends on how its surface REFLECTS light

Reflection Definition: the bouncing back of a wave as it hits a surface through which it CANNOT pass through

REFRACTION can cause you to see something that may not actually be there. When light rays enter a new medium at an angle, the change in speed causes them to BEND, or change DIRECTION

Refraction Definition: the bending of waves as they enter a new medium

Mirage Definition: is an image of a distant object caused by refraction of light

Rainbow Definition: forms when sunlight is refracted by tiny water droplets

Lenses

Lens Definition: is a curved piece of glass or other transparent material that is used to refract light

Concave Lens Definition: is thinner in the center than at the edges Because the light rays never meet, a concave lens can ONLY produce a VIRTUAL IMAGE

Concave Lens

Virtual Image Definition: an UPRIGHT image (formed where rays of light appear to meet or come from)

Convex Lens Definition: a lens that is thicker in the center than at the edges

A CONVEX LENS refracts parallel rays of light so that they meet at the focal point

Convex Lens

Real Image Definition: is an UPSIDE-DOWN, or INVERTED image

Color