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Journal # 35 4/30/12

Journal # 35 4/30/12. WITHOUT USING YOUR NOTES!!!. If you know the focal length of a concave mirror, where should you place an object so that its image is upright and larger compared to the object? Will this produce a real or virtual image?. Journal #35 Answers.

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Journal # 35 4/30/12

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  1. Journal #35 4/30/12 WITHOUT USING YOUR NOTES!!! • If you know the focal length of a concave mirror, where should you place an object so that its image is upright and larger compared to the object? • Will this produce a real or virtual image?

  2. Journal #35 Answers • Place the object between the focal point and the mirror. • The image will be virtual.

  3. Lens/Mirror Equation • unitsof length MUST match • f stands for focal length • di is the distance from the mirror/lens to the image • do is the distance from the mirror/lens to the object

  4. Image Height • Magnification of an image can be found by a series of ratios between the distances of objects and their images and their respective heights as shown below.

  5. Helpful Hints for Mirror Probs • In the formula, the numbers can tell you the characteristics of the image: • Size • Reduced ( |hi| < ho ) • Same Size ( |hi| = ho ) • Enlarged( |hi| > ho ) • Orientation • Upright(hi positive) • Inverted (hi negative) • Type of Image • Real (di positive, in front of mirror) • Virtual (di negative, behind the mirror)

  6. Practice Problems • Textbook p. 469 #13-16

  7. p. 469

  8. Try to fill in this chart from memory… best way to study!

  9. Answer Key to Table

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