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Curved Mirrors

Curved Mirrors. Physics 1161: Lecture 21. Textbook sections 26-3 & 26-4. Preflight 21.1. Which ray is NOT correct?. p.a. 36%. 1). R. f. 2). 45%. 3). 18%. Preflight 21.1. Which ray is NOT correct?. Ray through center should reflect back on self. p.a. 1). R. f. 2). 3).

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Curved Mirrors

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  1. Curved Mirrors Physics 1161: Lecture 21 • Textbook sections 26-3 & 26-4

  2. Preflight 21.1 Which ray is NOT correct? p.a. 36% 1) R f 2) 45% 3) 18%

  3. Preflight 21.1 Which ray is NOT correct? Ray through center should reflect back on self. p.a. 1) R f 2) 3)

  4. Preflight 21.3 The image produced by a concave mirror of a real object is: • Always Real • Always Virtual • Sometimes Real, Sometimes Virtual 30% 30% 39%

  5. Where in front of a concave mirror should you place an object so that the image is virtual? • Close to mirror • Far from mirror • Either close or far • Not Possible

  6. Where in front of a concave mirror should you place an object so that the image is virtual? • Close to mirror • Far from mirror • Either close or far • Not Possible

  7. Preflight 21.2 Compared to the candle, the image will be: • Larger • Smaller • Same Size Example Solving Equations A candle is placed 6 cm in front of a concave mirror with focal length f=2 cm. Determine the image location. p.a. R f 29% 59% 12%

  8. Preflight 21.2 Compared to the candle, the image will be: • Larger • Smaller • Same Size Example Solving Equations A candle is placed 6 cm in front of a concave mirror with focal length f=2 cm. Determine the image location. di = + 3 cm (in front of mirror) Real Image! p.a. R f

  9. C C C F F F Object Image Image Object Object Image 3 Cases for Concave Mirrors Upright Enlarged Virtual Inside F Inverted Enlarged Real Between C&F Inverted Reduced Real Past C Physics 1161: Lecture 17, Slide 9

  10. Example Solving Equations A candle is placed 6 cm in front of a convex mirror with focal length f=-3 cm. Determine the image location. Determine the magnification of the candle. If the candle is 9 cm tall, how tall does the image candle appear to be?

  11. Virtual Image! Diverging mirror! Image is Upright! Example Solving Equations A candle is placed 6 cm in front of a convex mirror with focal length f=-3 cm. Determine the image location. Determine the magnification of the candle. If the candle is 9 cm tall, how tall does the image candle appear to be? di = - 2 cm (behind mirror) m = + 1/3 hi = + 3 cm

  12. Preflight 21.4 The image produced by a convex mirror of a real object is ? • Always real • Always virtual • Sometimes real and sometimes virtual 24% 61% 15%

  13. Mirror Summary • Angle of incidence = Angle of Reflection • Principal Rays • Parallel to P.A.: Reflects through focus • Through focus: Reflects parallel to P.A. • Through center: Reflects back on self • |f| = R/2

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