# Grade 5 Light Study Guide

### 28 terms by fslack

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### Light can travel in two ways: as a

wave or a particle

straight lines

### Light wave type

transverse (up and down)

### Peak

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

### Amplitude

the distance from the mid or "resting point" to a peak

### 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

The angle at which a light wave strikes a mirror

### 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

the "bending" of light when it travels from one medium to another

### Transparent

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

water, glass

### Translucent

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

waxed paper

### 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

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

### Convex lens

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

### Concave lens

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

### 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

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

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

red

Violet

### 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

Radio, microwave, infrared, visible, ultraviolet, X-ray, gamma ray

Example: