1 / 14

Chapter 13: Lenses and Optical Devices

Chapter 13: Lenses and Optical Devices. 13.1 Lenses and the Formation of Images. Basic Lens Shapes. There are two basic shapes of lenses:. C on c ave Lenses ( Diverging ) C onvex Lenses ( C onverging ). Types of Lenses. Converging Lens

tdetrick
Télécharger la présentation

Chapter 13: Lenses and Optical Devices

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. Chapter 13: Lenses and Optical Devices 13.1 Lenses and the Formation of Images

  2. Basic Lens Shapes There are two basic shapes of lenses: • ConcaveLenses (Diverging) • ConvexLenses (Converging)

  3. Types of Lenses

  4. Converging Lens • Parallel light rays converge through a single point after they travel through the lens. • Lens is thickest in the middle • Diverging Lens • Parallel light rays diverge after they travel through the lens. • Lens is thickest at the edge

  5. Lenses use Refraction • Light is refracted twice as it passes through a lens: once from air to glass, and once from glass to air. • Ray diagrams are simplified by drawing a dashed line through the center of the lens and showing refraction occurring at this line.

  6. Diverging Concave Lens

  7. terminology • Axis of Symmetry: imaginary vertical line drawn through the optical centre perpendicular to the principal axis (through the middle of the lens) • Optical centre: point where the axis of symmetry meets the principal axis • Principal focus: where all the rays meet. • Secondary principal focus: point on the other side of the lens equal in distance from the principal focus.

  8. Click on this hyperlink to see a diverging lens in action

  9. Diverging (Concave) Lenses Light rays of a diverging lens do not converge. If you project these diverging rays backwards, it looks as if they come from a virtual focus.

  10. Uses of Concave Lenses • Images formed are smaller, virtual and upright. • Some types of eyeglasses and telescopes use concave lenses along with convex lenses (which are more useful)

  11. Converging (Convex) Lens

  12. Click on this hyperlink to see converging lens in action

  13. Ray Diagrams with Converging Lenses Table 11.7 on p. 453 • 1)Copy this table into your notebook (includes uses) • 2)Copy the steps for drawing a convex lens ray diagram on page 454 in your notebook.

  14. Homework / Classwork P. 454 #1-4

More Related