Vocab and terms
Define Law of Reflection.
The angle of reflection equals the angle of incidence.
How many waves is the light wave made of?
Two perpendicular waves.
if you see a fish swimming towards you should you strike your spear in front, behind, or right at the fish?
In front of it.
What colors do you need to put together to get the color blue?
Green and yellow
Name all of the colors of the rainbow in order.
ROY G BIV red, orange, yellow, green, blue, indigo, violet.
Define electromagnetic wave.
A transverse wave composed of an oscillating electric field and a magnetic field that oscillates perpendicular to the electric field.
In order for you to see a rainbow, what three conditions must happen?
Water droplets, the sun behind you, and the sun at a certain angle.
Name the two different types of lenses.
Converging and Diverging lenses.
Why should you not stare directly at the sun without eye protection?
Because sunlight can burn out your retina which can cause damage or loss of sight.
Do radio waves have higher or lower frequencies than visible light?
They have lower frequencies than visible light.
What is the electromagnetic spectrum and the visible spectrum?
Electromagnetic spectrum is a complete representation of all electromagnetic waves in creation.
Visible spectrum is the small part of the electromagnetic spectrum which we can see with our eyes.
What does Einsteins Special Theory of relativity say about speed of light?
That nothing with mass can travel faster than the speed of light.
Do you always have to have a reflection when light hits a surface? Why or why not?
It depends on the object and the angle the light hits the object.
What are the light sensitive cells that make up the retina called?
Rods and Cones
What do light waves oscillate?
Magnetic field and an electric field.
Wave Theory
the assumption that light is not a particle but a wave.
When light travels from one substance to another, what two things can happen to the direction of the light ray's travel.
It can reflect or refract.
What does someone mean when they say that light has been refracted?
It has entered and object and bent in response to its change of speed.
Ciliary Muscle, Iris, Pupil, Cornea, Lens, Retina, Optic Nerve.
What are electromagnetic waves with longer wavelengths than visible light called?
Infrared Light
When light or sound waves bounce off an obstacle.
What is the particle theory?
That a beam of light behaves the same way as a stream of particles.
What happens when light strikes a substance that is supposed to slow it down? How about if it strikes a substance that is supposed to speed it up?
1:The light ray will bend towards a line perpendicular to the surface it strikes.2: The light ray will bend away from a line perpendicular to the surface it strikes.
What does the converging and diverging lens do?
1: The converging lens causes light rays to bend so they converge to a single point. 2: Diverging lenses cause light rays to bend away from each other.
Why do you see objects?