How can we see non-luminous objects?
We can see them when light from a light source hits the object and the reflected light enters our eyes.
What are objects that produce their own light called?
Objects that produce their own light are called light sources or luminous objects.
Give two examples of artificial light sources that do not use electricity.
A lighted candle and a campfire are artificial light sources that do not use electricity.
Which animals can produce their own light?
Fireflies and most jellyfish can produce their own light.
What would happen if there were no light?
If there were no light, we would not be able to see anything.
What happens when there is no reflected light from objects?
We cannot see the objects.
Why is light important for us?
Light brightens our world and makes it visible.
What happens to light when it hits a non-luminous object?
When light hits a non-luminous object, the light is reflected.
Why does a luminous object look bright in any direction?
Because light from the object travels in straight lines in all directions.
Why can we not see anything in a completely dark place?
Because no light enters our eyes.
What is light?
Light is a form of energy that enables us to see the things around us.
Can we see non-luminous objects in the dark?
No, we cannot see non-luminous objects in the dark.
Why is the Moon not a luminous object?
ecause the Moon does not produce its own light; it only reflects sunlight.
What must enter our eyes for us to see an object?
Light must enter our eyes for us to see an object.
How can we see fireworks from far away?
We can see them because their light travels in all directions as long as we are not too far and our view is not blocked.
Why can we see the rays of sunlight through the trees?
Because light travels in a straight line.
What are artificial light sources?
Artificial light sources are light sources made by humans.
What are objects that do not produce their own light called?
They are called non-luminous objects.
Why can we see a luminous object?
Because the light it produces enters our eyes.
Why can we see objects around us during the daytime?
Because sunlight hits objects and the reflected light enters our eyes.
What do animals like fireflies do in the dark?
They glow in the dark.
Why is the Sun our main source of light?
The Sun is our main source of light because it produces its own light and shines on Earth.
How do we see buildings and roads at night?
Light from bulbs and street lamps hits the buildings and roads, is reflected, and enters our eyes.
How does the brain help us see?
The eyes send the image to the brain, and the brain interprets what we see.
Name two natural light sources besides the Sun.
Stars and lightning are natural light sources.
What produces light during the daytime?
The Sun produces light during the daytime.
Give two examples of artificial light sources that use electricity.
A glowing light bulb and a traffic light use electricity to produce light.
What are the main light sources at night?
Electric bulbs and street lamps are the main light sources at night.
What type of light source is the Sun?
The Sun is a natural light source.
Give two examples of non-luminous objects.
Food and color pencils are non-luminous objects.