Grade 5 Light Study Guide

Light can travel in two ways: as a
wave or a particle

Light waves travel in
straight lines

Light wave type
Light wave type
transverse (up and down)

Peak
Peak
the high point (crest) or low point (trough) of a wave

Amplitude
Amplitude
the distance from the mid or “resting point” to a peak

Wavelength
Wavelength
The distance between identical parts of a wave

Reflection
the “bouncing” of light form a shiny surface back to our eyes

Angle of Incidence
Angle of Incidence
The angle at which a light wave strikes a mirror

Angle of Reflection
Angle of Reflection
The angle at which a light wave leaves a mirror

The Law of Reflection
The Angle of Incidence is the same as the Angle of Reflection; when light strikes a mirror at a certain angle, it bounces off at the same angle, only reversed.

Refraction
Refraction
the “bending” of light when it travels from one medium to another

Transparent
Transparent
“see-through;” rays of light pass all the way through. An object behind this kind of medium can be clearly seen.

Transparent medium example
water, glass

Translucent
Translucent
transmits some light through but not all. An object behind this kind of medium will appear fuzzy or blurry.

Translucent medium example
waxed paper

Opaque
Opaque
does not allow any light to pass through. An object behind this kind of medium cannot be seen at all.

Opaque example
wood, metal, people

Lens
Lens
a transparent object that refracts (bends) light rays as they pass through it

Convex lens
Convex lens
A lens which curves outward. Light waves passing through it converge on a focal point.

Concave lens
Concave lens
A lens which caves in. Light waves passing through it diverge (spread apart).

An image seen through a convex lens
An image seen through a convex lens
will be large and upright it the lens is close to it; or small and upside-down (inverted) if the lens is farther away than the focal point.

An image seen through a concave lens
An image seen through a concave lens
appears smaller than life size, and right side up.

Visible light
the part of the electromagnetic spectrum that you can see; the colors of the rainbow

ROY G BV
ROY G BV
Red Orange Yellow Green Blue Violet
(the colors that make up White Light)

The color with the longest wavelength
red

The color with the shortest wavelength
Violet

Prism
Prism
a type of lens that can be used to refract white light and break it up into ROY G BV

Electromagnetic Spectrum Wave Types
Electromagnetic Spectrum Wave Types
Radio, microwave, infrared, visible, ultraviolet, X-ray, gamma ray