Science - Light

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The flashcards below were created by user mshowley on FreezingBlue Flashcards.


  1. What is light?
    Light is a form of energy
  2. What are luminous objects? Give an example
    They make their own light, for example, the sun
  3. What are non luminous objects? Give an example
    They reflect light, for example, the moon
  4. State a property of light
    Light travels in striaght lines

    Light travels faster than sound
  5. Define reflection
    This is light bouncing back off a surface
  6. What is diffuse reflection?
    This happens when light bounces off a rough surface in all directions
  7. What is regular diffusion?
    This happens when light bounces in one direction off a smooth surface
  8. What is a periscope?
    A periscope has two mirrors at opposite ends of a tube

    It is used to see over things
  9. Give a use for a periscope
    To see over a high wall or crowds

    Used in submarines
  10. What is a shadow?
    This is a dark area behind something where the light cannot reach
  11. What is a medium?
    This is a solid, liquid or gas which allows waves to travel through it
  12. What is dispersion?
    This is the splitting of light into the seven colours of the spectrum using a glass prism
  13. List the seven colours of the spectrum
    Red

    Orange

    Yellow

    Green

    Blue

    Indigo

    Violet

    Ring Out Your Great Bells In Victory
  14. List the primary colours
    Red

    Green

    Blue
  15. List the secondary colours
    Yellow

    Cyan

    Magenta
  16. Define refraction
    Refraction is the bending of light as it passes from one surface to another eg. from air to glass
  17. State the function of a lens
    To reflect or bend light
  18. List the two types of lens
    Convex lens is for long sighted people.  It focuses the light so that the image is formed back onto the retina

    Concave lens is for short sighted people.  It focuses the light so that the image is formed further forward onto the retina
  19. Name the part labelled A

    Iris
  20. Name the part labelled B

    Pupil
  21. Name the part labelled C

    Cornea
  22. Name the part labelled D

    Lens
  23. Name the part labelled E

    Retina
  24. Name the part labelled F

    Optic Nerve
  25. State the function of the iris
    To control the amount of light entering the eye
  26. State the function of the pupil
    To allow light enter the eye
  27. State the function of the lens
    To make a sharp picture on the retina

    It focuses light onto the retina
  28. State the function of the retina
    To change the picture into nerve messages
  29. State the function of the optic nerve
    To carry messages from the eye to the brain
  30. State the function of the ciliary muscle
    To change the shape of the lens and allow us to see things either close up or far away
  31. State the function of the cornea
    To allow light into the eye and bend the light rays
  32. What are cones?
    These are nerve cells located on the retina that allow us to see colours
  33. What are rods?
    These are cells that are found in our eye that allow us to see in black and white

Card Set Information

Author:
mshowley
ID:
146106
Filename:
Science - Light
Updated:
2017-06-20 11:28:50
Tags:
Light
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Description:
Light
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