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Applications of Lenses and Mirrors

Applications of Lenses and Mirrors. Combinations of Lenses. Image of 1 st lens calculated as though the 2 nd lens were not present. Image formed by 1 st lens is treated as the object for the 2 nd lens. Object in front of lens = real (d o +) Object behind lens = virtual (d o -).

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Applications of Lenses and Mirrors

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  1. Applications of Lenses and Mirrors

  2. Combinations of Lenses Image of 1st lens calculated as though the 2nd lens were not present. Image formed by 1st lens is treated as the object for the 2nd lens. Object in front of lens = real (do+) Object behind lens = virtual (do -)

  3. 30.0 cm 20.0 cm f2 = 20.0 cm f1 = 10.0 cm Lens 1: di = 15 cm m = -1/2 Lens 2: di = - 6.7 cm m = 4/3 Virtual image 6.7 cm to left of L2 M = -2/3 (inverted)

  4. 30.0 cm 10.0 cm f2 = 20.0 cm f1 = 10.0 cm Lens 1: di = 15 cm m = - 1/2 Lens 2: 4 cm m = di = 4/5 Real image 4 cm to right of L2 M = -2/5 (inverted)

  5. If the 2 lenses are put back-to-back to form a single lens, what is f? L1: d0 = ∞, di = +10.0 cm L2: d0 = -10.0 di = 0.067 cm

  6. 30 cm c) 10 cm, inverted d) 16.7 cm e) M = -2/3

  7. Type of image: Type of lens: real converging

  8. Focusing: adjust position of lens to put image on film

  9. Aperture similar to iris

  10. Film Projector Type of image produced: enlarged, real converging Type of lens used: slightly beyond F Position of object:

  11. Motion Pictures Persistence of Vision

  12. Duplicating (Xerox) Machine Copy is a real image of original Type of lens: Converging For same size image, object located: @ 2F For enlargement, object located: bet. F & 2F For reduction, object located: beyond 2F

  13. Magnifying Lens Magnifying Lens enlarged, virtual Type of image: Type of lens: Converging Position of object: just inside F

  14. Telescope Objective lens forms a real image of the object. The eyepiece lens forms an enlarged virtual image of the real image.

  15. Compound Microscope

  16. Spherical Aberration When mirror (or lens) is spherical in shape, rays which reflect off edges converge too quickly. Results in a blurry image.

  17. SOLUTION: Mirror: make mirror parabolic in shape Lens: Use a circular stop (diaphragm) in front of lens If block a portion of the lens, image becomes dimmer.

  18. Chromatic Aberration Dispersion of light into colors produces convergence at different points and a blurry image.

  19. SOLUTION: (for lens) Achromatic lens is a combination converging and diverging lens. Cancels effect of dispersion.

  20. Correction for chromatic aberration in mirrors? No dispersion for mirrors

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