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Unit 3: Light and Optical Instruments

Unit 3: Light and Optical Instruments. Lesson 4: Concave and Convex Reflections. J. Pulickeel January 2007. Reflecting on Reflections. Reflections occur when light rays bounce off objects. We can predict the direction in which reflected light rays travel by using the laws of reflection.

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Unit 3: Light and Optical Instruments

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  1. Unit 3: Light and Optical Instruments Lesson 4: Concave and Convex Reflections J. Pulickeel January 2007

  2. Reflecting on Reflections • Reflections occur when light rays bounce off objects. • We can predict the direction in which reflected light rays travel by using the laws of reflection • The angle of reflection will ALWAYS equal the angle of incidence • The incident ray, the normal and the reflected ray are all in the same plane

  3. YAY!!! MIRRORS!!!!

  4. Mirror, Mirror on the Wall

  5. Concave and Convex • A ConcaveMirror is a mirror that is curved inwards (like the mouth of a cave) • The bowl of a spoon is concave

  6. Concave and Convex • Convex mirrors are mirrors that bulge outward like the surface of a shiny balloon

  7. Concave Chaos • A concave mirror can change the attitude of your image. The attitude describes if the image is upright or upside down

  8. Concave Chaos • A concave mirror can also make the image appear larger or smaller • It depends on where the image is relative to the concave surface

  9. Concave Chaos Radius ½ Radius Focal Point Centre of Curvature

  10. Object behind the Centre Click here for online activity • If the object is behind the centre of curvature, it will appear upside down and smaller

  11. Object at the Centre Click here for online activity • If the object is at the centre of curvature, it will appear upside down but the same size

  12. Object in front of the Centre Click here for online activity • If the object is in front of the centre of curvature, it will appear upside down and larger

  13. Object in front of the Focal Point Click here for online activity • If the object is in front of the focal point, it will appear upright and larger

  14. Convex Mirrors • Convex mirrors are more common than concave mirrors. They always produce smaller upright images. • Because the image is smaller you can see more of the overall scene

  15. Convex Mirrors Click here for online activity • A convex mirror is just the other side of a concave mirror!

  16. Concave Lenses • A lens is a curved piece of transparent material . • A Concave lense is thinner and flatter in the middle • When light passes through the thicker more curved parts, it will bend more

  17. A Convex lense is thicker and rounder in the middle • This causes the refracting light rays to converge

  18. In Summary

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