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Learning Objectives

Learn about the effects of light traveling in straight lines on image formation, laws of reflection for curved mirrors, and the properties and applications of concave and convex mirrors. Understand how to locate images and differentiate between real and virtual images.

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Learning Objectives

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Presentation Transcript

  1. Learning Objectives • To observe the effect of light travelling in straight lines on the formation of images • To observe a ‘real’ image • To apply the laws of reflection for curved mirrors

  2. 11.9: Images in Curved Mirrors

  3. Concave vs. Convex

  4. Terminology of Concave Mirrors Centre of Curvature (C): The centre of the sphere whose surface has been used to make the mirror.

  5. Principal Axis: The line through the centre of curvature to the midpoint of the mirror. • Vertex (V): The point where the principal axis meets the mirror.

  6. Focus (F): the point where reflected rays from parallel incident rays pass through, or converge. This is why concave mirrors are sometimes called converging mirrors.

  7. Centre of Curvature C (2F) Focal length (f) Principal Axis Focal Point, or Focus (F) Vertex Reflective Surface

  8. Laws of Reflection inConverging (Concave) Mirrors • A light ray parallelto the principal axis is reflected throughthe focus.

  9. 2. A ray throughthefocus will reflect parallel to the principal axis.

  10. 3. A ray through the centre of curvature is reflected back on itself.

  11. 4. A ray aimed at the vertex will follow the law of reflection.

  12. Locating the Image in a Concave Mirror

  13. Case A: Object is placed behind C

  14. Case B: Object is placed at C

  15. Case C: Object is placed between C and F

  16. Case D: Object is placed at F

  17. Case E: Object is placed in front of F

  18. Real Images • A real image is created when light rays actually arrive at the image location. • If you place a screen in front of the mirror, a focused image will be seen. • When an object is placed beyondF, an inverted, real image will be formed. • When an object is placed in front of F, an upright, virtual image will be formed.

  19. Properties of Images in Converging Mirrors In front, closer Beyond C Smaller Inverted Real In front, same At C Same Inverted Real Between C & F In front, further Larger Inverted Real At F No Clear Image Behind, further Inside F Larger Upright Virtual

  20. Applications of Converging Mirrors • Searchlights • Satellite dishes • Solar cookers

  21. Concave mirrors cause reflected rays to converge to a central point (Focus), giving a bright, forward, beam of light. The less curvature, the longer the focal length.

  22. Convex mirrors cause reflected rays to diverge, giving a much wider field of view.

  23. In a convex / diverging mirror, F and C are behind the reflective surface.

  24. Locating Images in Diverging Mirrors Rules: • A ray parallel to the principal axis is reflected as if it had come through the focus.

  25. 2. A ray aimed at the focus is reflected parallel to the principal axis.

  26. 3. A ray aimed at the centre of curvature is reflected back on itself.

  27. Images in a Diverging (Convex) Mirror • Images will always be smaller and virtual because rays never cross to form a real image.

  28. Applications of Diverging Mirrors • Rear-view mirrors • Security mirrors

  29. ROYGBIV says: • Page 501 # 1 – 10 • Worksheet: Images in Curved Mirrors

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