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Refraction – Using Rays

Refraction – Using Rays. Refraction. Lenses. Lens - carefully ground or molded piece of transparent material that refracts light rays in such as way as to form an image. . Lenses. Converging (Double Convex) Lenses Diverging (Double Concave) Lenses. Triple slit, lens … trace lens and box

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Refraction – Using Rays

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  1. Refraction – Using Rays

  2. Refraction

  3. Lenses Lens - carefully ground or molded piece of transparent material that refracts light rays in such as way as to form an image.

  4. .

  5. Lenses

  6. Converging (Double Convex) Lenses Diverging (Double Concave) Lenses Triple slit, lens … trace lens and box For both converging and diverging lenses: 1) Trace incident and reflected rays. 2) Extend reflected rays back for diverging to find image. 3) Where do rays intersect? What type of image is it? 4) How do lens drawings compare?

  7. Converging Lenses (Double Convex) Three rules of refraction for a double convex lens: 1) Any incident ray traveling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens. 2) Any incident ray traveling through the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis. 3) An incident ray that passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.

  8. Drawing Ray Diagrams for Converging Lenses 1. Pick a point on the top of the object and draw three incident rays traveling towards the lens. 2. Once these incident rays strike the lens, refract them according to the three rules of refraction for converging lenses. 3. Mark the image of the top of the object. 4. Repeat the process for the bottom of the object.

  9. Practice – Converging Lenses

  10. Converging Lenses L O S T

  11. Converging Lenses LOST

  12. Diverging Lenses (Double Concave) • Three rules of refraction for double concave lenses: • Any incident ray traveling parallel to the principal axis of a diverging lens will refract through the lens and travel in line with the focal point (i.e., in a direction such that its extension will pass through the focal point). • Any incident ray traveling towards the focal point on the way to the lens will • refract through the lens and travel parallel to the principal axis. • An incident ray that passes through the center of the lens will in affect continue • in the same direction that it had when it entered the lens.

  13. Drawing Ray Diagrams - Diverging Lenses • Pick a point on the top of the object and draw three incident rays traveling towards the lens. • 2. Once these incident rays strike the lens, refract them • according to the three rules of refraction for • double concave lenses. • 3. Locate and mark the image of the top of the object. • The image point of the top of the object is the point • where the three refracted rays intersect. • 4. Repeat the process for the bottom of the object.

  14. Practice – Diverging Lenses

  15. Diverging Lenses (Double Concave) L O S T • The diagrams above show that in each case, the image is • located on the object' side of the lens • a virtual image • an upright image • reduced in size (i.e., smaller than the object)

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