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What are the two types of light?
Natural and artificial
What is artificial light?
A light source that is made by humans
An object that produces light
What is natural light?
A light source that does not need electricity to produce light
Light sources are also called...
luminous objects
Objects that do not produce light are called...
Non-luminous objects
Give an example of a natural light source
Sun, stars, lightning
Should we ever stare directly at the Sun?
No
Give an example of an artificial light source
Light bulb, candle, fireworks
What is our main source of natural light?
The Sun
What is light?
A form of energy that enables (allows) us to see things
How does light travel?
In straight lines in all directions
What sensory organ allows us to see?
Our eyes
How do we see non-luminous objects?
The light from a light source hits the non-luminous object and is reflected into our eyes.
If there is no light, can we see? Yes/no
No
How do we see at night?
Staring at a very bright object, like the sun, can cause....
Eye damage
What can we wear to protect our eyes from bright light?
Sunglasses
Cell phones and tablets must be used in....
proper brightness
Reading in a very bright light or very dim area will cause...
eye strain
What are some animals that produce their own light?
Fire flies and jellyfish
Artificial
Light that is NOT bright is....
dim
Is the Moon a luminous or non-luminous object?
Non-luminous
What organ interprets the light that goes through our eyes?