Light is Energy Part 2

Light is Energy Part 2

by Mr. Farmer

​Properties of Light

• ​Light is caused by the release of energy from tiny particles in matter

  • ​Matter: What all things are made of.

• ​When they gain energy, they become "excited". This is done by heating them up.

• ​Light bulb works this way.

  • ​Electricity flows in , tiny particles in metal move around, heat up, and energy is released as white light.

​Behavior of Light

• ​Light travels in a straight line until it its an object.

• ​The hitting and bouncing of light is called a reflection.

  • ​Reflection: Bounce back

• ​Smooth surfaces reflect in 1 direction.

  • ​Rough surfaces reflect in many directions, or scatter the light.

    • ​Scatter: To reflect in many directions.

​

​Some objects allow light to pass through, but it bends. This is Refraction. Some material will cause light to slow down as well, like water.

The amount of bend depends on the material.​

Refraction

When light enters an object without reflecting or refracting.

Tiny particles absorb certain colors. The remaining bounce off.​

Absorption: taken in and not reflected or thrown back.

Absorption

Match

Match each behavior of light with its correct description

• Reflection

• Refraction

• Absorption

The bouncing back of light when it hits a surface

The bending of light as it passes from one medium to another

The transfer of light energy to matter

• The bouncing back of light when it hits a surface

• The bending of light as it passes from one medium to another

• The transfer of light energy to matter

Materials that Affect Light

Allows light to pass through without mixing or bouncing.

We can clearly see an object on the other side of transparent materials.

Example: clear glass​

Transparent

Materials that let some light pass through. However, when light passes through, the material mixes up the light rays slightly

Translucent

Materials block or reflect all light.

Stop all light from coming through​.

Examples: Wood, Steel, Humans​

Opaque

Match

Match the definition with the vocab word.

• opaque

• transparent

• translucent

Blocks all light

Allow all light to pass through

These materials allow most light to pass through

• Blocks all light

• Allow all light to pass through

• These materials allow most light to pass through

Categorize

Options (15)

Water

Glass

Smooth Plastic

Cling Wrap

Air

Wood

Metal

Brick

Concrete

Cardboard

Frosted glass

Ice

Thin fabric

Wax paper

Stained Glass

Place the following objects in the correct category

Opaque

Translucent

Transparent

Not A Category

Multiple Choice

These materials block or reflect all the light. You cannot see through these materials.

• opaque

• transparent

• translucent

Optics

The Study of Light

Multiple Choice

Which scientist conducted an experiment that proved that white light is made up of all the colors of the rainbow?

• Jane Goodall

• Albert Einstein

• Isaac Newton

• George Washington Carver

They curve inward.

Narrow center and thicker outer edges.

Light passes through and refract away from each other.

Items seen through this lens looks smaller.​

​​Concave Lens

They curve outward.

Narrow outer edges and thicker center.

Light passes through and refract towards each other.

Items seen through this lens looks bigger.​

​​Convex Lens

Labelling

Place the label on top of the correct type of lens.

Then determine whether the light converge in the middle or diverge outward towards the edges of the lens.

Drag labels to their correct position on the image

Convex

Concave

Converge

Diverge

Galileo Galilei used this to study planets and stars.

Convex glass that bends light to see far away planets.​

Changed the way people thought about space.​

​​Telescope

Instrument used to with either one or multiple convex lenses.

This is used to make extremely small objects visible.​

​​Microscope

Light Phenomena

Rainbows, Optical illusions, and shadows

Rainbows occur when light passes through the raindrops.

Each drop acts as a prism, refracting the sun's white light into rainbow colors.

Rainbows

These are a trick of the eye. They show the difference between what your brain expects and what your eye sees.

Optical Illusions

These are caused by the absence of light.

Occur because light travels in a straight line. When light hits an opaque object, the object blocks the light on the other side.

Two parts: umbra​ and the penumbra

Umbra: darkest part

Penumbra: slightly lighter edge.​

​Some text here about the topic of discussion.

Shadows

Multiple Choice

When light strikes an opaque object, the object blocks the light from traveling through it. This produces a ______________ on the other side.

• Rainbow

• Optical Illusion

• Shadow