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Converging Lenses

Converging Lenses. Section 4.6 Lesson 13. Uses for lenses. Lenses. A lens is a thin transparent piece of glass or plastic that has at least one curved side The sides can be concave, convex or both. Lenses. A lens changes the direction in which light

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Converging Lenses

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  1. Converging Lenses Section 4.6 Lesson 13

  2. Uses for lenses

  3. Lenses • A lens is a thin transparent piece of glass or plastic that has at least one curved side • The sides can be concave, convex or both

  4. Lenses • A lens changes the direction in which light • If the light rays come together it is a converging lens, if the rays move apart it is a diverging lens

  5. Our eyes have lenses • Our eye uses a lens to focus an image of an object on the retina of the eye • The brain then interprets that image (one more “flip”)

  6. Vision correction using lenses Diverging lens – used to correct short-sightedness Converging lens – used to correct farsightedness

  7. Converging lens • Because light can travel in both directions through a lens there are two focal points – one on either side of the lens

  8. Draw a straight line through the centre of the converging lens – this is the axis of symmetry principalaxis F F1

  9. Drawing Ray Diagrams • Step 1 • Draw a straight line (the axis of symmetry) through the centre of the lens perpendicular to the principal axis • An incident ray drawn parallel to the principal axis will refract through the focus on the other side of the lens

  10. For an object beyond 2F1 principalaxis F 2F1 F1

  11. Drawing Ray Diagrams • Step 2 • Draw an incident ray through F1 that will refract through the lens parallel to the principal axis

  12. principalaxis F F1

  13. Drawing Ray Diagrams • Step 3 • An incident ray aimed at the centre of the lens will pass through the lens

  14. principalaxis F F1

  15. Identify the characteristics of this image: principalaxis F F1 closer inverted smaller real L: _____________ O: _____________ S: ____________ T: ________

  16. Notes • Complete the handouts: • 4.6 Converging Lenses: Drawing Ray Diagrams • 4.6 What are lenses and what are some of their applications? (Summary)

  17. Vocabulary Journal • Add this term and definition: • lens

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