Reading in a _____ area will cause eye strain.
Dark
Fire is an example of ________ object.
Luminous
Firefly is an example of _________ light.
Natural
Fireworks are example of ________ light.
Artificial
Light made by humans are called_________.
Artificial
What do you call the objects that produces their own light?
Light source
Noodles is an example of ________ object.
Non-luminous
It is our main source of light?
Sun
Jellyfish is an example of ______ object.
Luminous
Objects that does not produce their own light is called?
Non-luminous object
How do light travels?
straight line