1 / 17

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

nida
Télécharger la présentation

Converging Lenses

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related