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Flat & Curved Mirrors

Flat & Curved Mirrors. Terminology of Reflection. Normal Line. Incident Ray. Reflected Ray. < i. <r. < i = <r. Laws of Reflection. 1 . < i is equal to < r 2. Incident ray, reflected ray and the normal all lie in the same plane. . Locating an image in Flat Mirror.

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Flat & Curved Mirrors

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  1. Flat & Curved Mirrors

  2. Terminology of Reflection Normal Line Incident Ray Reflected Ray <i <r <i = <r

  3. Laws of Reflection • 1. <iis equal to <r • 2. Incident ray, reflected ray and the normal all lie in the same plane.

  4. Locating an image in Flat Mirror • Can use equidistance property as an easy way to locate image in flat mirrors mirror

  5. SALT Size Smaller vs. Same vs. Larger Attitude Upright vs. Inverted Location Where the image is located Type Real (image on same side as object) vs. Virtual (image is behind mirror)

  6. Concave Mirrors Locating images Applications

  7. Drawing Concave Mirror template 1st: Draw a straight principal axis 2nd :Pick a point as your Vertex (V) 3rd : Pick a point as your Centre (C) 4th: F = ½ C 5th: Use your compass to draw the lens V C F

  8. Concave Mirrors - Rules • Incident rays entering to a “Cave” • Concave = converging A ray going through the centre of curvature (C) is reflected back through C A ray parallel to principal axis is reflected through the focal point Principal axis V C F A ray going through the focal point is be reflected parallel to the principal axis A ray going through the vertex is reflected at the same angle (<i = <r)

  9. Concave Mirrors – Real vs. Virtual Image • Image on SAME SIDE as object = REAL Image (can be captured on “screen”) • Image behind the mirror = VIRTUAL Image Object VIRTUAL Image REAL Image

  10. Concave Mirrors – Finding the Image Image is: S – smaller A – inverted L – between C&F T – Real image • Simply use 2 of the rules • If object is Beyond C: V C F

  11. Concave Mirrors – Finding the Image Image is: S – same size A – inverted L – At C T – Real image If object is at C V C F

  12. Concave Mirrors – Finding the Image Image is: S – larger A – inverted L – Beyond C T – Real image If object is between C & F V C F

  13. Concave Mirrors – Finding the Image NO clear image If object is at F: Parallel lines do not meet up C V F

  14. Concave Mirrors – Finding the Image If object is between F and V: C V F Image is: S – larger A – upright L – behind mirror T – Virtual image

  15. Concave Mirrors animation

  16. Applications of Concave Mirror Solar cooker  parallel beams of light from the Sun will converge at focus (F) Others: convergence of signals on satellite dish

  17. Applications of Concave Mirror Search light  need parallel beams of light • Set filament at focus (F)

  18. Convex Mirrors Locating images Applications

  19. Convex Mirrors - Rules 1st: A ray parallel to p.a. is reflected AS IF it had come through F • Rays ”bouncing off a ball” • Convex = diverging 2nd: A ray AIMED at C is reflected back upon itself. Principal axis V F C 3rd: A ray AIMED at F is reflected parallel to p.a.

  20. Convex Mirrors – Finding the Image • Incident rays ”bouncing off a ball” • Image is ALWAYS smaller and virtual Important Step!! Extend line backward. V F C

  21. Convex Mirror animation

  22. Applications of Convex Mirror Security mirror  convex mirrors show a wide range of view with their smaller virtual image.

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