Optics 1

• Clear path


  • No object should block you from seeing the laser
• Direction

  • Light has to enter through the direction of your eye
• Single hand test


  1. Put your hand in front of the laser

  2. Hand will be between the laser and the object

  3. Laser will stop at your hand

  4. Object wouldn't be touched by the laser as your hand isn't transparent
• Luminous objects


  Sources of light
• Non-luminous objects


  Objects that are not sources of light, they don't give off light
• Light energy moves in a straight line
• Ray model of light


  A diagram where we show where light is traveling, represented by a straight line with arrowheads to show the direction
• Beam


  A bundle of parallel rays
• Drawing a ray of light

  Draw parallel lines from the light to the eyes to show they are seeing it