Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

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.
We do not share your email address with others. It is only used to allow you to reset your password. For details read 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.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
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


Cornea The transparent of the front of the eye; covers both the iris and the pupil; also helps refract light.
Pupil A hole that controls the amount of light that enters the eye by adjusting in size.
Iris THe part of the eye that adjusts the size of the pupil; provides characteristic eye color.
Lens A transparent object that refracts light waves such that they converge or diverge to create an image.
Convex Lens A lens that is thicker in the middle than at the edges.
Retina Structure at the back of the eye upon which the lens form an image.
Optic Nerve Eye structure that transmits information about an image formed on the retina to the brain.
Electromagnetic Spectrum All of the frequencies or wavelengths of electromagnetic radiation.
Radio Waves Electromagnetic waves that have the longest wavelength, lowest frequency, and least amount of energy.
Infrared Light
Visible Light
Ultraviolet Light
X-Rays Electromagnetic waves with short wavelengths, high frequencies and high energy that can
Gamma Rays The shortest electromagnetic waves that have the highest frequencies and highest energy.
Created by: DiamondDollaBill