Optics: Refraction of Light in Lenses

Optics: Refraction of Light in Lenses

1. OPTICS (Lenses) Prepared by: Ms. Jasmine Nikki M. Versoza

2. LENSES Smoothly curved transparent materials usually made of glass or plastic Has one or two curved surfaces

3. CONVEX LENSES Converging lenses Parallel rays are refracted towards the thick part of the lens and converge on the other side

4. CONCAVE LENSES Diverging lenses Parallel rays are refracted towards the thick part of the lens and diverge on the other side

5. PARTS OF A LENS Principal axis - imaginary line passing through the center of the lens Lens axis - imaginary line which bisects the symmetrical lens into two

6. LENS AXIS OPTICAL CENTER PRINCIPAL FOCUS PRINCIPAL AXIS

7. CONVEX LENS F F f

8. CONCAVE LENS F F f

9. FOCAL LENGTH (f) Distance from the principal focus to the center of the lens

10. LOCATING THE IMAGE GRAPHICALLY CONVEX LENS The ray from the object parallel to the principal axis . This ray passes through the focus after refraction. This is ray 1. The ray passing through the center of the lens. This ray is not refracted . This is ray 2. This ray passes through the focus from the object and is refracted parallel to the principal axis. This is ray 3.

11. F F Ray 1 Ray 2 Ray 3 object image

12. LOCATING THE IMAGE GRAPHICALLY CONCAVE LENS The refracted ray comes from the focus . This is ray 1 coming from the object . The ray passing through the center of the lens. This ray is not refracted . This is ray 2.

13. F F object image Ray 1 Ray 2

14. LOST L - location (image distance) O - orientation (upright or inverted) S - size (reduced or enlarged) T - type of image (real or virtual)

15. EXERCISES Locate the images of the objects indicated in each figure using ray diagrams. Summarize your findings using a table 1.0

16. Location of object L O S T a. Between 1f and lens b. At the focal length 1f c. Between 1f and 2f d. At 2f e. Beyond 2f