Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Ch 4 Section 3&4

Science Key Terms

TermDefinition
index of refraction a measure of how much a ray of light bends when it enters that material
mirage an image of a distant objet caused by refraction of light
lens a curved piece of glass or other transparent material that is used to reflect light
convex lens thicker in the center than at the edges
concave lens thinner in the center than at the edges
cornea light enters the eye through the transparent front surface
pupil an opening through which light enters the inside of the eye
iris a ring of muscle that contracts and expands to change the size of the pupil
retina a layer of cells that line the inside of the eyeball
rods cells that contain a pigment that responds to small amounts of light
cones cells that respond to color
optic nerve the rods and cones send signals to the brain along a short thick nerve
nearsighted a person that can see nearby things clearly but objects at a distance are blurred
farsighted a person that can see distant objects clearly, but nearby objects appear blurry
Created by: lkdickson
Popular Physics sets

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards