Light

Light

What is light?
Light is a form of energy that travels in a wave from the light source.
What is a light source?
It's an objects that makes it's own light.

Multiple Choice

What is light?

• Light is a type of sound wave.
• Light is a form of solid matter.
• Light is a form of electromagnetic radiation.
• Light is a type of weather phenomenon.

Multiple Choice

What is a light source?

• A light source is a type of food
• A light source is a type of clothing
• A light source is a type of transportation
• A light source is a physical body that emits light.

How does light travel?

Light travels as a wave. But unlike waves of water or sound waves, it does not need a medium to travel through. This means light can travel through a vacuum - a completely airless space.

Multiple Choice

How does light travel?

• Light travels at the same speed as sound
• Light travels by bouncing off of objects
• Light travels in a zigzag pattern at a slow speed
• Light travels in a straight line at a speed of 299,792 kilometers per second (186,282 miles per second) in a vacuum.

When light bends from one medium to another.

Refraction

Is when light bounces off a surface, changing the direction of the ray of light

Reflection

Reflection and refraction

Multiple Choice

What is the difference between reflection and refraction?

• Reflection is the bending of light, while refraction is the bouncing back of light.
• Reflection is the absorption of light, while refraction is the emission of light.
• Reflection is the bouncing back of light, while refraction is the bending of light.
• Reflection is the slowing down of light, while refraction is the speeding up of light.

Shadows

A shadow is an area of darkness where light has been blocked out.
A shadow is always the same shape as the object that casts it. This is because when an opaque object is in the path of light travelling from a light source, it will block the light rays that hit it, while the rest of the light can continue travelling.
Shadows can also be elongated or shortened depending on the angle of the light source. A shadow is also larger when the object is closer to the light source. This is because it blocks more of the light.

Multiple Choice

What is a shadow?

• A shadow is a type of cloud formation.
• A shadow is a reflection of an object on a surface.
• A shadow is a dark area or shape produced by a body coming between rays of light and a surface.
• A shadow is a type of plant that grows in low light conditions.

Multiple Choice

How do you make a shadow larger?

• By using a smaller light source
• By increasing the distance between the light source and the object
• By reducing the intensity of the light source
• By moving the light source closer to the object casting the shadow.

Multiple Choice

How do you make a shadow smaller?

• Move the object closer to the light source or use a smaller light source.
• Increase the intensity of the light source
• Use a larger light source
• Move the object farther from the light source

The colour spectrum

Isaac Newton shone a light through a transparent prism, separating out light into the colours of the rainbow (red, orange, yellow, green, blue, indigo and violet) - the colours of the spectrum. All the colours together merge and make visible light.

Multiple Choice

How did Isaac Newton discover the colour spectrum?

• By passing a narrow beam of sunlight through a glass prism
• By studying the reflection of light off of water
• By mixing different colors of paint together
• By using a telescope to observe the stars

Angle of incidence and reflection

The angle of reflection is the angle between the normal line and the reflected ray light. The angle of incidence is the angle between the normal line and the incident ray of light.

Multiple Choice

What is the difference between the angle of reflection and angle of incidence?

• The difference between the angle of reflection and angle of incidence is that the angle of incidence is the angle between the incident ray and the normal, while the angle of reflection is the angle between the reflected ray and the normal.
• The angle of reflection is the angle between the incident ray and the normal
• The angle of incidence is the angle between the reflected ray and the normal
• The angle of reflection and angle of incidence are the same

Describes objects that do not let any light pass through them.

opaque

Transparent describes objects that let light travel through them easily, meaning you can see through the object. translucent Describes objects that things let some light through, but scatters the light so we can't see through them properly.

Transparent and translucent

Transparent, translucent and opaque.

Multiple Choice

What is the opposite of opaque?

• obscure
• solid
• transparent
• murky

Thank you