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Describe two differences between electromagnetic waves and other (mechanical) waves.

Describe two differences between electromagnetic waves and other (mechanical) waves. Write down the names of all seven types of electromagnetic waves in order of increasing frequency.

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Describe two differences between electromagnetic waves and other (mechanical) waves.

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  1. Describe two differences between electromagnetic waves and other (mechanical) waves. Write down the names of all seven types of electromagnetic waves in order of increasing frequency. The wavelength of microwave radiation produced by a microwave oven is 12.2 cm. Calculate the corresponding frequency.

  2. Curved Mirrors, Ray Diagrams and Nature of Image

  3. Question: How do we “see” things?

  4. Mirror Normal

  5. Mr. X Mirror Brick Wall ? A B C D

  6. Plane Mirrors Eye sees image back here Image is virtual and laterally inverted Light from object reflects into eye

  7. ATOYOT

  8. The two types of curved mirrors: Concave (Converging) Mirror Convex (Diverging) Mirror

  9. Concave (Converging) Mirrors

  10. Concave (Converging) Mirrors

  11. Concave Mirrors • Concave (or converging) mirrors focus light at the focal point. F

  12. Convex (Diverging) Mirrors

  13. Convex (Diverging) Mirrors

  14. Convex Mirrors • Convex mirrors have a focal point behind the mirror. • Convex (or diverging) mirrors spread the light rays apart so that they appear to have come from the focal point F

  15. Ray Diagrams

  16. r pa P F C f P = pole , pa = principal axis C = centre of curvature r = radius of curvature F = Focal point or focus f = focal length f = r / 2

  17. The two important rules: • Parallel to pa → Focal point • Focal point → Parallel to pa • (pa = principal axis, the horizontal line)

  18. Concave (Converging) Mirror

  19. 1. 2. 3. 4. 5.

  20. Concave (Converging) Mirror

  21. Convex (Diverging) Mirror

  22. Convex (Diverging) Mirror

  23. Concave (converging) mirrors • The image will be real, invertedif the object is located behind the principal focus. • The image will be virtual, upright and enlargedifthe object is located between the mirror and the principal focus. • Convex (diverging) mirrors • A convex mirror always produces virtual images which are always upright and smaller than the object. The image is formed behind the mirror, between the principal focus and the mirror.

  24. Mirror Formulae ONE • Descartes’ Formula: • and: • m= magnification factor • h= height • d = distance from mirror

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