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10.7 – THIN CONVEX lenses

10.7 – THIN CONVEX lenses. Also called, why the human eye is spherical instead of flat. Ever wondered…?. WWBAT… Describe how an image is formed by a thin convex lens Determine the location of image formation for a thin convex lens

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10.7 – THIN CONVEX lenses

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  1. 10.7 – THIN CONVEX lenses Also called, why the human eye is spherical instead of flat.

  2. Ever wondered…?

  3. WWBAT… • Describe how an image is formed by a thin convex lens • Determine the location of image formation for a thin convex lens • Determine the magnification of an image for a thin convex lens • Determine whether or not an image is upright or inverted for a thin convex lens • Determine whether an image is real or virtual for a thin convex lens Objectives

  4. Convex: bending outward • Thin convex lenses are also called biconvex or converging • Light rays from an object are refracted and converge to form a real image beyond the lens Image formation by refractionin thin convex lenses

  5. The focal length of a thin convex lens is the point beyond the lens where all head-on light rays converge when refracted • This is notwhere the image forms, however! Focal length

  6. Questions to ask • Where does the image form? • Is the image upright or inverted (upside down)? • Is the image larger or smaller than the original image? How to predict image formation for thin convex lenses

  7. Ray Diagramsfor thin convex lenses

  8. Ray Diagramsfor thin convex lenses

  9. Ray Diagramsfor thin convex lenses

  10. Ray Diagramsfor thin convex lenses

  11. Check out the PhET Virtual Lab on the course website! Ray Diagramsfor thin convex lenses

  12. A tricky example…

  13. A tricky example…

  14. A tricky example…

  15. An even trickier example…

  16. The Five Cases

  17. Check yourself #1

  18. Check yourself #1

  19. Math of image formation

  20. Math of image formation

  21. A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance and the image size.

  22. A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance and the image size.

  23. A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance and the image size.

  24. A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance and the image size.

  25. 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. (NOTE: this is the same object and the same lens, only this time the object is placed closer to the lens.) Determine the image distance and the image size. You Try

  26. 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. (NOTE: this is the same object and the same lens, only this time the object is placed closer to the lens.) Determine the image distance and the image size. You Try

  27. WWBAT… • Describe how an image is formed by a thin convex lens • Determine the location of image formation for a thin convex lens • Determine the magnification of an image for a thin convex lens • Determine whether or not an image is upright or inverted for a thin convex lens • Determine whether an image is real or virtual for a thin convex lens Objectives

  28. Extra resources on the website about how the eye works! Still want more?

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