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Optics: Mirrors and Lenses

Optics: Mirrors and Lenses. 23-2, 23-3. Plane Mirror. Flat, smooth, regular reflection Image is reversed left to right or front to back. Plane Mirrors. object- -source of diverging light rays; luminous or illuminated image- -point where extended rays apparently intersect

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Optics: Mirrors and Lenses

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  1. Optics: Mirrors and Lenses 23-2, 23-3

  2. Plane Mirror • Flat, smooth, regular reflection • Image is reversed left to right or front to back

  3. Plane Mirrors • object--source of diverging light rays; luminous or illuminated • image--point where extended rays apparently intersect • virtualimage--no source is really there; rays appear to diverge w/o doing so • realimage--rays from object converge

  4. Concave Mirrors • reflects light from inner surface • part of hollow a sphere • Radius – r from geometric center of sphere

  5. Spherical Abberation • Parallel rays converge at Focus (F) only if close to principal axis • Farther rays converge at a point closer to mirror; therefore, image is a disk NOT a point (fuzzy image)

  6. Spherical Abberation • Parabolic mirrors have NO SA L used to focus rays from distant stars to a sharp focus in telescopes • Hubble vsflashlights

  7. Real vs Virtual Images • Real images – light rays actually converge and pass through the image. Can be projected onto paper or a screen • Virtual image – light rays diverge; cannot be projected or captured on paper/screen since rays DO NOT converge

  8. Images from Concave Mirrors

  9. Da Rules • Rays parallel to Primary Axis reflect through the Focus • Rays passing thru focus are reflected parallel to Primary Axis • Rays perpendicular to mirror are reflected back upon themselves and goes through the center of curvature.

  10. Da Rules 2 • Beyond C – if object farther from mirror than C, then image is real, inverted and reduced • As object moves toward C then images move toward C and are real, inverted and reduced • If the object is at C, then the image is at C and is real inverted and the same size • If the object is inside C toward F then the image out beyond C, and is real, inverted, and enlarged

  11. Convex Mirror Rules 3 • As the object approaches F – the image moves farther out • If the object is at F – then all reflected rays are parallel, image at ∞

  12. Convex Mirror Rules 4 • If object between F & mirror – then no real image exists, virtual image behind mirror

  13. Mirror and Lens Equation • ho/hi = do/di • 1/do + 1/di = 1/f

  14. Magnification • m = hi/ho = -di/do

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