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Reflection & Mirrors

Reflection & Mirrors. Recap:. Diffuse reflection: gives a blurry image (or none at all). Specular reflection: gives a clear image. Mirror types: PLANE CONVEX CONCAVE . Plane Mirrors. The image formed by plane mirrors can only be seen behind the mirror.

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Reflection & Mirrors

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  1. Reflection & Mirrors

  2. Recap: Diffuse reflection: gives a blurry image (or none at all) Specular reflection: gives a clear image Mirror types: PLANE CONVEX CONCAVE

  3. Plane Mirrors • The image formed by plane mirrors can only be seen behind the mirror. • This is known as a virtual image. • Image is the same size as the object. • Only the right and left of the image is changed.

  4. Curved mirrors can be either concave (making a little cave) – Causes light to converge convex (vexing out in the middle) – Causes light to diverge Curved Mirrors

  5. Law of Reflection

  6. Ray Diagrams • Show path of light from object  mirror  away from mirror • Allows you to determine the location and properties of an image formed by a mirror or lens

  7. Ray Diagram: Basic set-up mirror r (radius of curvature) f (focal length) Principal axis C (center of curvature) F (focal point) ** r = 2f

  8. Ray Diagrams: images • REAL vs. VIRTUAL • UPRIGHT vs. INVERTED • SAME SIZE, SMALLER, ENLARGED COMPARE IMAGE TO ORIGINAL OBJECT

  9. Real or Virtual Real images can project on a screen Virtual images can only be seen in a mirror

  10. Upright or Inverted Upright images are oriented the same as the object Inverted images are oriented in the opposite direction as the object

  11. Reduced or Enlarged Reduced images are smaller in size than the object Enlarged images are larger in size than the object

  12. Get ready to draw diagrams… • Take 2 different colored pencils • Take a slice of index card/Ruler • This will be your straight-edge • PUT YOUR NAME ON IT & KEEP IT • Decorate it if you want to • Take a notes packet • Ready? Let’s do this!

  13. Concave Mirror A Step 1: draw horizontal ray from top of object to mirror Step 2: draw reflected ray from point where ray hits mirror through focal point Step 3: draw second ray from top of object through focal point to mirror Step 4: draw reflected ray from point where ray hits mirror horizontally back Step 5: draw image from principal axis to intersection of reflected rays F Image is: REAL INVERTED LARGER FARTHER

  14. Concave Mirror B Step 1: draw horizontal ray from top of object to mirror Step 2: draw reflected ray through focal point Step 3: draw second ray from focal point, through top of object, to mirror Step 4: draw horizontal reflected ray Step 5: continue both reflected rays behind mirror as DASHED LINES Step 6: draw image from principal axis to intersection of reflected rays F Image is: VIRTUAL UPRIGHT LARGER FARTHER

  15. Convex Mirror Step 1: draw horizontal ray from top of object to mirror Step 2: draw reflected ray from focal point through point where ray hit mirror and out Step 3: draw angled ray, aimed at focal point, to mirror Step 4: draw horizontal reflected ray Step 5: continue both reflected rays behind mirror as DASHED LINES Step 6: draw image from principal axis to intersection of reflected rays F Image is: VIRTUAL UPRIGHT SMALLER CLOSER

  16. Questions? • Begin optics packet!

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