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Learning Objectives

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. 11.9: Images in Curved Mirrors. Concave vs. Convex. Terminology of Concave Mirrors.

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Learning Objectives

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  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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