What is Light?

_____ is a form of energy.

light

Often sources of _____ give off heat.

light

_____light is made up of all colors.

white

colors of light

red, orange, yellow, green, blue, indigo, violet; ROYGBIV

All light is made of _____

waves

A _____ is the distance from the top of one wave to the top of the next wave.

wavelength

_____ has the longest wavelength while _____ light has the shortest.

red, violet

_____ is the 7 colors of light that make up white light.

visible spectrum

The _____ spectrum is only a small part of the _____ spectrum.

visible, electromagnetic

The _____ wavelengths are _____ waves and have the _____ energy.

longest, radio, lowest

The _____ wavelengths are _____ waves and have the _____ energy.

shortest, gamma, highest

A _____ forms when light is blocked and has the shape of whatever is blocking the light.

shadow

Shadows show that light travels in _____ lines or _____.

straight, rays

Light cannot _____ or _____.

bend, go around things

The size of a shadow depends on the _____.

angle of the light ray

Light that reaches your eyes is ____ light.

reflected

____ occurs when light strikes a surface and bounces off.

reflection

Most surfaces _____ at least some light.

reflect

_____ surfaces reflect the most light.

shiny

The law of reflection is when the _____ of reflected light is _____ to the ______.

incoming angle, equal, outgoing angle

_____ is the bending of light as it passes from one material to another.

refraction

Most materials _____ the light falling on them.

reflect

Some materials allow light to _____.

pass through

_____ happens when light passes through glass, water, or other transparent materials.

refraction

Light travels at different _____ in different materials.

speeds

The _____ the material, the _____ light travels through it.

denser, slower

Light _____ and _____ at the point where it passes from _____ to _____.

slows, bends; air, water

During refraction the light ray simply _____ as it passes from one _____ to another.

changes direction, material

2 kinds of lenses.

convex, concave

_____ lens bulges in the middle and brings rays of light _____

convex, together

_____ lens curves _____ and spreads light rays _____.

concave, inward, apart

The color of an object depends on the color of _____ it reflects.

visible spectrum

_____ and _____ are not true colors

black, white

_____ objects do not absorb any _____.

white, light energy

White objects are _____ in sunlight.

cooler

_____ objects absorb all of the _____ of the _____.

black, wavelengths, visible spectrum

Black objects are _____ in sunlight.

warmer

_____ objects are made of material that light cannot pass through (wood, people).

opaque

_____ objects let light pass through ( glass).

transparent

_____ material reflects some light and lets the rest pass through (a plastic cup).

translucent

_____ are thin beams that have one _____ of light.

lasers, wavelength