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Refl ec tion

Refl ec tion. http://www.worldofstock.com/closeups/ANB1276.php. Terms & Definitions. Luminous : Radiates its own light Non-Luminous : Does not radiate or reflect light. Light Ray : An arrow that shows the direction in which light is travelling.

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Refl ec tion

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  1. Reflection

  2. http://www.worldofstock.com/closeups/ANB1276.php

  3. Terms & Definitions • Luminous: Radiates its own light • Non-Luminous: Does not radiate or reflect light. • LightRay: An arrow that shows the direction in which light is travelling. • Incident Light: The ray of light that strikes a mirror • ReflectedLight: The ray of light that bounces off of the mirror once incident light rays have hit it. • Normal: The 90°line that is drawn straight from the point at which the incident ray and reflected ray meet. • Plane Mirror : The surface of a flat mirror. • Perpendicular: when two lines are at 90°to each other.

  4. Laws of Reflection The angle of incidence and angle of reflection are EQUAL. The INCIDENT ray and the REFLECTED ray are on opposite sides of the NORMAL The normal, incident ray and reflected ray are all on the SAME PLANE.

  5. Rules for Ray Lines SOLID Ray line for a light ray that is reflected from the object off the mirror and into the eye of the viewer DOTTED Ray line for a IMAGINARY light ray that is passing from the virtual image of the object, towards the mirror and into the eye of the viewer.

  6. file:///Users/HJMB/B%20Ed/Practice%20Teaching%20Binder/Tab%204%20Lesson%20Plans/Gr10%20Optics%20SHSS/lsps07_vid_lightreflect/lsps07_vid_lightreflect.htmlfile:///Users/HJMB/B%20Ed/Practice%20Teaching%20Binder/Tab%204%20Lesson%20Plans/Gr10%20Optics%20SHSS/lsps07_vid_lightreflect/lsps07_vid_lightreflect.html

  7. Angles are equal

  8. Regular Reflection

  9. Diffused or Regular ?

  10. Diffused Reflection

  11. Diffused or Regular Reflection?

  12. Regular or Diffuse?

  13. Regular or Diffuse?

  14. End of Part 1!

  15. What is the nature of images that form in plane mirrors? Mirror

  16. R and Mirrors Lab • When describing the image of an object, we use the acronym: S A L T • Size • Attitude • Location • Type • Using the Rs, try to figure it the nature of images out on your own.

  17. S – Same size • A – Both are upright, but LATERALLY INVERTED • L – It appears to be the same distance from the mirror • T – Imaginary

  18. S – Same size • A – Both are upright, but LATERALLY INVERTED • L – It appears to be the same distance from the mirror • T – Imaginary • Note: the dog has it’s RIGHT ear up, the dog in the mirror appears to have it’s LEFT ear up!!

  19. 1) Laterally Inverted Image

  20. 2) Upright Image

  21. 3) Image & Object Same Distance

  22. 4) Image & Object are Same Colour

  23. 5) Virtual Image Plane mirrors will always form a virtual image.

  24. End of part 2!

  25. How do we draw images formed by plane mirrors?

  26. Plane Mirror HOUSE KEEPING: • Smooth • Flat surface • Coating of silver or aluminum on one side. • Layer of paint to protect shiny coating of silver or aluminum. • FIVE properties of plane mirror

  27. Laws of Reflection The angle of incidence and angle of reflection are EQUAL. The INCIDENT ray and the REFLECTED ray are on opposite sides of the NORMAL The normal, incident ray and reflected ray are all on the SAME PLANE.

  28. U – Object Distance Mirror V – Image Distance U = V

  29. Images in a Plane Mirror A A’ Object Image

  30. A Object Image Images in a Plane Mirror STEP 1. Draw a NORMAL from your object to the mirror STEP 2. Continue the line past the mirror as a DASHED line

  31. A Object Image Images in a Plane Mirror STEP 3. Draw a ray line from the object to anywhere on the mirror STEP 4. Draw an normal where the ray hits the mirror STEP 5. Draw the REFLECTED ray at the same angle to the normal STEP 6. Extend the reflected ray beyond the mirror as a dashed line

  32. A Object Image Images in a Plane Mirror STEP 7. Repeat steps 1 to 6 with the other end of the arrow

  33. A Object Image Images in a Plane Mirror STEP 8. Draw your object in Your arrow head goes where the two lines from the arrow head cross!

  34. FLAT Mirror • Used to see our reflection to check our appearance. • Plane mirrors are used in homes and offices to make the space appear bigger • Optical instruments make use of mirrors: • microscopes, • reflecting telescopes & • periscopes.

  35. FLAT Mirror • Java Applet gives an interactive flat mirror ray diagram (make angle 180 degrees): http://www.phy.ntnu.edu.tw/oldjava/optics/image_e.htm • Java Applet gives an interactive flat mirror ray diagram that you can draw on or just move the face: http://www.phy.ntnu.edu.tw/oldjava/optics/mirror_e.html OTHER APPLICATIONS

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