Conditions for Sight
The four conditions needed to see are _____, _____, ______, and _______.
Light, eyes, unblocked path, and an object.
This part of your body allows you to see.
Eye
TRUE OR FALSE: A shadow always moves TOWARDS a light source.
FALSE: A shadow moves in the opposite direction of the light source.
Light can interact with objects in _____ different ways (how many?)
3
What is the difference between an opaque and transparent object.
An opaque object blocks light from shining through it. A transparent object allows light to shine through it.
I am in my room with the door closed and hear a sound in the next room. Which condition for sight prevents me from seeing what happened?
Unblocked path.
This part of your eye acts as a WINDOW and allows light in
Pupil
TRUE or FALSE: A shadow is a reflection of darkness.
FALSE: A shadow occurs when light is being blocked from reaching a surface by an object.
Provide an example of an OPAQUE object and a TRANSPARENT object.
Possible answers for OPAQUE: Cardboard, chair, paper, wall
Possible answers for TRANSPARENT: Glass, plastic wrap, Ziplock bag
What are the 3 ways that light can interact with an object?
Reflect/Scatter, Transmit, and Absorb
A girl is looking at a tree outside.
Explain the PATH OF LIGHT that allows the girl to see the tree (where does it start, where does it go, where does it end up)?
The light shines from the sun, bounces off of the tree, and goes into the girls eyes.
This part of your eye is known as the SENSOR, and detects the light that comes in,
Retina
What is a shadow?
A shadow occurs when light is blocked from reaching a surface.
Light reflects off of a ______ surface, like a mirror, and scatters off of a ______ surface, like paper.
smooth; rough
That means that light is able to shine through it.
How does light travel? (Straight, curvy, wavy, or zig-zag lines?)
Light travels in straight lines.
This part of your eye is the MESSENGER. It passes information from your eye to your brain.
Optic Nerve
What parts of the light model do you need in order to see a shadow?
Light, object, unblocked path, eyes.
What can happen when an object ABSORBS light?
It can heat the object, or create electricity, or cause movement.
What caused the colored water to ABSORB more light than the clear water?
It absorbed more light because it is darker. Darker colors absorb more light than lighter colors or clear objects.
John and Justin are playing hide and seek at home. From the back of a room John says he can see Justin around the corner in the next room. Is John cheating, or can he see around the corner? Explain.
John is cheating. Since light travels in straight lines, there must be a direct path between Justin and John for John to see Justin. Since John is around a corner, there is no diect path between the two, so John cannot see Justin.
You would NOT be able to see if you were missing any part of your eye. Without the pupil, no light would be able to enter your eye. Without the retina, your eye wouldn't be able to detect the light. Without the optic nerve, your brain wouldn't be able to tell you what you're seeing.
I hold my hand up to a flashlight and make a shadow on the wall. Explain why my shadow is in the exact shape of my hand.
Because that hand is what is blocking the light, so the shadow will show the exact outline of where the light is being blocked.
Explain how you can see a car through a window.
Light reflects off of the car and transmits through the window because it is transparent, allowing the light to reach my eyes so I can see the car.
Explain why the sunshine feels warm on your skin.
The sun feels warm on my skin because my body ABSORBS the sunlight.