Light Behavior
When light bounces back off a material, the light is ___________.
Reflected
Is the human eye a light source?
No
What is the colored part of your eye called?
Iris
If you are colorblind, what is wrong with your eyes?
You can't see some or all colors.
Describe how a rainbow is made.
White light shines through a transparent object (rain drop, prism, etc.) and separates into its rainbow colors. We see these rainbow colors as a rainbow in the air.
When light passes straight through a material, the light is _________.
Transmitted
Give two examples of luminous objects and two examples of non-luminous objects.
Answers will vary.
What is the cornea lens?
It is the transparent lens on the outside of your eye that lets light pass through, but prevents other objects from getting through your pupil.
What are two reasons you would need to go to the doctor if you had a black eye?
Blood in your eye or if you are having trouble seeing
If the image on your retina appears upside down, why don't we see everything upside down?
Our brains combine the images from both eyes and flip them right side up.
When light is stopped by a material and it does not pass through, the light is _________.
Absorbed
What is the difference between a luminous object and a non-luminous object?
A luminous object creates its own light. A non-luminous object does not create its own light, so it has to reflect light from a luminous object in order to be seen.
What does your retina do?
It acts like a screen where the light can focus and create an image.
What types of foods should you eat to strengthen your eyes?
Foods with Vitamin A
Give an example of a transparent, translucent, and opaque object.
Answers will vary.
When light is bent or spread out when it passes through a material, the light is _________.
Refracted
Describe what we saw when we were in a room that had a light source vs. a room that did not have any light sources.
When there was a light source, our eyes adjust (pupils grow bigger to collect more light) and we can start to see non-luminous objects.
When there is no light source, our eyes cannot collect any light so we can't see anything.
What part of our eyes connect the retina to our brains?
Optic nerve
What is wrong with your eyes if you have blurry vision and have to wear contacts or glasses? (not blindness, just blurry)
The retina at the back of your eye is just a little too close or a little too far away from the lens at the front of your eye.
Why can some animals see in the dark, but humans cannot?
Animals that can see in the dark have much larger pupils, so their eyes can collect even the smallest amount of light in order to see.
When white light is spread out into its rainbow colors, the light is __________.
Dispersed
What is the cause of red eyes when someone takes a picture of you in the dark?
The camera flash is lighting up the blood vessels on the retina at the back of your eye.
Why does the pupil get bigger and smaller?
Our pupils get bigger to let more light in when it is darker, and they get smaller to let less light in when it is brighter to avoid damaging your eye.
Describe two reasons why someone might be blind and what they would see.
1. Something is wrong with their cornea lens/born without a cornea lens. They would see shadows and light, but no images.
2. Something is wrong with their optic nerve so their eyes and brain can't communicate. They would just see blackness.
What does it mean for an object to be transparent, translucent, and opaque?
Transparent: All light passes through the object, and we see the objects on the other side exactly how we would see them if the transparent object weren't there.
Translucent: Some light passes through, but the objects on the other side do not look exactly the same. They might be blurry or a different color.
Opaque: No light passes through, so we cannot see the objects on the other side at all.