Mirror and lens notes

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Mirror and Lens Informaton

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Mirror and lens notes

  1. 1. Mirrors & LensesHow Light Moves
  2. 2. Review When light strikes an object, 3 things can happen. The light can be: Reflected Transmitted Absorbed
  3. 3. Reflection Off A Plane MirrorLight reflects off a plane (flat) mirror in a certain way.Incident Ray Normal Reflected Ray Angle of Angle of incidence reflection Plane Mirror
  4. 4. The Law of ReflectionThe Law of Reflection states that for a plane mirror: Angle of Incidence = Angle of Reflection Incident Ray Normal Reflected Ray Angle of Angle of incidence incidence Plane Mirror
  5. 5. Images In A Plane MirrorLight rays reflect off a plane mirror in a regular way. Angle of the light = Angle to come from This makesIncidence rays seemof Reflection behind the mirror at an equal distance.. This forms an image that is upright and the same size. It is a virtual image, since the light is not actually coming from the image.
  6. 6. Forming A Virtual Image Virtual Image Upright Same Size Reversed
  7. 7. Concave Mirrors Concave mirrors have surfaces that curve inward. A concave mirror reflects light rays so that they converge (meet) at a certain point. We call this point the focal point of the mirror.
  8. 8. Concave Mirrors Concave mirrors form images in 2 different ways. The type of image depends on the distance the object is placed from the focal point. Focal Point
  9. 9. 1. Object is placed behind the focal point. Real Image Upside down Smaller2. Object is placed in front of the focal point. Virtual Image Upright Larger
  10. 10. Convex MirrorsConvex mirrors have surfaces that curves outward. A convex mirror reflects light rays so that they diverge (spread out). The light rays do NOT meet at a focal point in front of the mirror.
  11. 11. Convex MirrorsConvex mirrors ALWAYS form images the same way. A convex mirror forms a virtual image that is smaller than the true object. Focal Point
  12. 12. Refraction Refraction is when light rays are bent. When light rays pass from one material to another, the light rays refract (bend). The rays change direction where the 2 materials meet. The light bends because it changes speed in different materials (mediums).
  13. 13. Refraction Medium 1 - Air Light travels fast Medium 1 - Water Light travels slow
  14. 14. Index of RefractionSome mediums refract light rays more than others. This is described by the index of refraction.
  15. 15. Index of RefractionSome mediums refract light rays more than others. This is described by the index of refraction.
  16. 16. Index of RefractionSome mediums refract light rays more than others. This is described by the index of refraction.
  17. 17. Index of Refraction Indexes of Refraction for Common Materials Vacuum 1.00 Air 1.01 Water 1.33 Glycerine 1.47 Glass 1.52 Diamond 2.42
  18. 18. LensesA lens is a curved device that refracts light precisely. Lenses are useful because they can refract light rays in a predictable way. There are 2 types of lenses: Concave Convex
  19. 19. Concave Lens A concave lens is thinner in the middle. A concave lens bends parallel light rays to make them diverge. Produce a virtual image only
  20. 20. Convex Lens A convex lens is thicker in the middle. A convex lens bends parallel light rays so that they meet at a focal point. Produce a real or a virtual image
  21. 21. Lenses Lenses have many uses.
  22. 22. Any Questions?

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