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

light

QuestionAnswer
periscope experiment. position your eye as indicated in the diagram.light from a distant source hits the upper mirror.this light reflects to the lower mirror and then reflects into your eye. the operation of the periscope has been demonstrated.
what is the main purpose of the periscope? to see over obstacles.
how does a periscope work? light from a distant object being reflected in the upper mirror. this light falls to the lower mirror and is relected again into the eye. the mirrors are set at 45 degrees to enable this reflection to occur.
why do submarines use periscopes? they use periscopes to gain sight of vessels on the water surface.
an example of refraction is... a pencil in water.
what is refraction? refraction of light is the bending of light as it passes from one medium to another.
refraction from air to glass and glass to air. u can c d lite beam on d paper as it head 4 d glass block.d lite bends as it enters d glass. d lite bends as it leaves d glass block. remember which way d lite bends as it enters and leaves d glass.
applications of refraction. telescopes, microscopes, prisms, contact lenses.
application of lenses. far sighted- converging convex lens. near sighted- diverging concave lens.
what is light? light is a form of energy that is got from the sun. it travels extremely fast. its euation is 3x10 ( 2 d power of 8) ms ( to d power of -1)
experiment: to show that light travels in straight lines. equipment: a bulb and 3 pieces of cardboard. method: take 3 similar pieces of cardboard. put a hole in d exact centre of each of them. place d 3 pieces of cardboard between ur eye and d bulb. result: u will c d light if d holes r in a straight line.
how does light travel? it travels in a straight line.
why is light a form of energy? as it can make things move.
why are shadows formed? as light travels in straight lines and light cannot pass through certain materials e.g. opaque materials.
what are luminous objetcs? objects that give out light. eg a candle.
what are non luminuous objects? objects that dont give out light but refelct light from luminuous objects. e.g. the moon.
what is dispersion? the breaking up of white light into its component colours. red orange yellow green blue indigo violet.
Created by: cliodhna
Popular Science 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