simple and understandable ppt on light..

simple and understandable ppt on light..

• 1.
  WHAT IS LIGHT? Part2 Light is a form of energy! Energy-the ability to make something move, happen, or change.
• 2.
  VIDEO • Instructional Videos: •https://www.youtube.com/watch?v=ifbCsha7Syc - Bending of light | Laser bending demonstration
• 3.
  LIGHT - WHATWE SEE LIGHT - WHAT WE SEE •LIGHT- energy by wavelengths at a level we can see. •EM Spectrum- variety of wavelengths and frequency. Light is small band within.
• 4.
  Vocabulary WAVELENGTH Anything that causes adisturbance and transmits energy through matter. (ie: ripple on pond) FREQUENCY Number of waves in a set time. Decides energy level.
• 6.
  The Electromagnetic Spectrum
• 7.
  VISIBLE LIGHT (part ofEM spectrum)
• 8.
  What We See •In order for an object to be visible, it must either give off its own light (be a source of light) or it must reflect light. • The Sun, a candle flame, or a flashlight gives off visible light. • The Moon and many objects around us reflect light in order to be seen.
• 9.
  What We See •The different colors of light are revealed when white light is passed through a prism and • separated into the different colors of the rainbow, called spectrum. • These colors are related to the different amounts of energy in white light. • Each color represents a different amount of energy.
• 10.
  TO SEE COLOR •Differentcolors represent different wavelengths. •Blue- smaller wavelengths •Red- larger wavelengths •Color Order: ROY G BIV red, orange, yellow, green, blue, indigo, violet
• 11.
  COLOR •Light, or “whitelight”, is made up of all colors of light mixed together. •If white light is passed through a prism, it can be separated into light of different colors. •The colors are red, orange, yellow, green, blue, indigo, and violet. •These are the colors seen in a rainbow.
• 12.
  COLOR The prism doesnot create new colors, but merely separates the colors that are already there.
• 13.
  COLOR
• 14.
  RAINBOWS •The rainbow iscaused by sunshine (white light) shining on water droplets that are in the air just after a summer shower. •Thousands of these water droplets break up the light, just like Sir Isaac Newton's prism. •Can you make a rainbow? Of course! Make your own rainbow by turning on the garden hose, which has a nozzle that will make a fine mist, or spray. Make sure the sunlight is coming over your shoulder. You have made a rainbow.
• 15.
  WHITE LIGHT Adding color makesWHITE Deleting color makesBLACK
• 16.
  COLOR -decided by whatabsorbed. If object reflects color, that is what we see. All color reflected = white If an object absorbs, then it hides color. All color absorbed = black
• 17.
  LENSES CONVEX Thick in themiddle, thinner on the edges Appear larger and closer ie: eyeball, microscope, telescope, magnifying glass, glasses to correct farsightedness CONCAVE Thinner in the middle, thick on the edges Appear smaller and more remote ie: glasses to correct nearsightedness
• 18.
  LENSES Alters the directionof light Convex brings to focal point Concave spreads out
• 19.
  LENSES https://youtu.be/N6n0FAZ_6N8
• 20.
  QUESTIONS