What happens when light reaches an object?
Which would absorb more energy? A beaker with 5 drops of red food coloring or a beaker with plain water?
The beaker with red dye
Light travels in a ____________ line.
Straight
What are the two types of invisible light closest in wavelength to the visible light spectrum?
Infrared and Ultraviolet
The opening in your eye that light enters
The Pupil
What unit is light measured in?
Lux
What are the two types of reflection, and what is the difference?
Regular and Scattered (diffuse). Regular reflection occurs light when bounces off an object at the same angle it bounced in at. This occurs on a smooth, polished surface. Scattered reflection occurs when light strikes a rough or unpolished surface and bounces off at different angles.
What is the light source we rely on most on earth?
The sun
True or false: We can see almost all of the light on the electromagnetic spectrum
False. Visible light is a very small portion of the electromagnetic spectrum.
The colored part of the eye which dilates and constricts to control the amount of light that enters the eye
The Iris
What are the colors of the visible light spectrum?
ROY G. BIV (Red, orange, yellow, green, blue, indigo and violet)
This is what its called when light passes across a transparent or translucent object
Transmission
What are the four things we need to see?
Light, eyes, clear path and an object
Name one use for both infrared and ultraviolet
IR: Greenhouses, heat lamps, night vision cameras, remote controls, wireless video games
UV: Tanning, identifying certain animals in the dark, cleaning of food or surgical equipment, decoration, and production of vitamin d
The protective layer covering the pupil of the eye whose job is to keep out dust and debris
The Cornea
According to the light model, why is a shadow larger when the object casting the shadow is closer to the light source?
Because the closer the object is to the light, the more of the light source is blocked.
What is the difference between transparent and translucent?
Transparent objects are see-through and allow all or almost all light to pass through. Translucent objects are not see-through but still allow some light to pass through them.
If the clear path of light is blocked by an object before it reaches the surface it is shining on, what will happen?
A shadow will form
Does infrared or ultraviolet have a longer wavelength?
Infrared
The cord that carries information from the eye to the brain
The Optic Nerve
What is a device that collects data by detecting things like light, heat, and motion?
A sensor
What is it called when light is bent, like light shining through a prism?
Refraction
When we look at a banana, we see the color yellow because ___________ is being reflected and ____________ is being absorbed
The yellow wavelength; every other color
Put the following into the correct order from largest to smallest wavelength.
Visible light, Infrared, Ultraviolet, Radio waves, Gamma Rays, Microwaves and X Rays
Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, X Rays, and Gamma Rays
The part at the back of the eyeball where the image you are seeing is projected. Home to the rod and cone cells
The Retina
Which color on the visible light spectrum has the longest wavelength?
Red