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- 1. Concave Mirrors The laws remain the same
- 2. The Sky Mirror in Monte Carlo
- 3. The Sky Mirror What do you notice about the mirror image you see?
- 4. Properties of Concave Mirrors <ul><li>Concave mirrors are shaped curved like a letter C or the inside of a sphere </li></ul><ul><li>You can identify them from other mirrors because light goes into them like entering a CAVE </li></ul><ul><li>Examples: the side of spoon you put food on, a makeup mirror, a satellite dish </li></ul>
- 5. How do we draw ray diagrams for Concave mirrors? <ul><li>It all comes back to the… </li></ul><ul><ul><li>Angle of incidence </li></ul></ul><ul><ul><li>Incident ray </li></ul></ul><ul><ul><li>Normal </li></ul></ul><ul><ul><li>Reflected ray </li></ul></ul><ul><ul><li>Angle of reflection </li></ul></ul><ul><li>SO… How do you do this on a curved surface? </li></ul>
- 6. You apply the SAME rules of reflection <ul><li>If you could make the mirror INFINITELY small, you would notice that for an instant the mirror acts like a flat plane at the point where light hits it </li></ul><ul><li>Therefore, you could consider that the curved mirror is made up of MANY small flat mirrors </li></ul>
- 7. Starting with the normal <ul><li>If a normal (perpendicular line) is drawn from each of the ‘flat’ parts of the curved mirror what do you notice? </li></ul><ul><li>All the lines will meet up at the same point </li></ul><ul><li>This is called the CENTER OF CURVATURE </li></ul>The centre horizontal line is the PRINCIPLE AXIS
- 8. The Principle Axis <ul><li>It is an important feature because it helps you locate the positions of objects that are in front of the mirror </li></ul><ul><li>The spot where the principle axis touches the mirror is called the VERTEX or V </li></ul><ul><li>If an incident ray goes through the center of curvature it gets reflected back on itself - JUST LIKE IT DOES when light hits a plane mirror through the normal (remember the center of curvature is where the normal all meet) </li></ul>
- 9. Rays Parallel to the Center of Curvature <ul><li>When rays run parallel to the principal axis what do you notice? </li></ul><ul><li>They intersect at the same point on the principal axis </li></ul><ul><li>This know as the FOCAL POINT or F </li></ul><ul><li>And the distance from the mirror (V=vertex) to the focal point is called the FOCAL LENGTH </li></ul>
- 10. So how do we Draw the Diagram? <ul><li>The best way to begin? </li></ul><ul><li>Put the bottom of the object on the principle axis </li></ul><ul><li>Because the principle axis is ALSO a normal, this means our IMAGE will also be on the principle axis </li></ul><ul><li>The next step is to find the TOP of the image in order to complete the diagram </li></ul>
- 11. How to draw Objects between the Focal Point and the Mirror
- 16. What do you notice about the image? RIGHT-SIDE UP and BEHIND the mirror
- 17. What if the Object is between the Focal Point and the Center of Curvature?
- 18. The Process is the Same
- 21. What do you notice about the image? UPSIDE-DOWN and in front of the center of curvature
- 22. What about when the object is in front of (or beyond) the Center of Curvature
- 26. What do you notice about the image? It’s UPSIDE DOWN and SMALLER
- 27. You can also Predict what your image looks like using equations!
- 28. Lets try a Practice Problem PG 426 <ul><li>A concave mirror has a focal length of 12cm. An object with a height of 2.5cm is placed 40.0cm in front of the mirror </li></ul><ul><li>A) calculate the image distance </li></ul><ul><li>B) calculate the image height </li></ul>
- 29. More Practice <ul><li>Read pages 419-430 </li></ul><ul><li>TB: questions 427, 1-5 </li></ul><ul><li>WB: pg 134-136 </li></ul><ul><li>STSE: TB 428-429 due Monday </li></ul>

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