Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Ch 18Mirrors and Lenses
Plane Mirror         flat, smooth surface that          reflects light in a regular          way;         it produces an...
Types of Images   Real image - source of converging light rays; can    be projected; are always inverted   Virtual image...
Concave Mirror   reflects light off its inner surface   Focal point - (f) point on the principle axis where    reflectin...
Spherical Aberration   defect of all spherical mirrors when the parallel rays    don’t all reflect through the focal poin...
Concave Mirror Characteristics                  If the object is outside C,                   the image is real,         ...
Concave Mirror Characteristics                  If the object is at C, the                   image is real, inverted,    ...
Concave Mirror Characteristics                  If the object is between                   C and f, the image is real,   ...
Concave Mirror Characteristics                  If the object is inside f,                   the image is virtual, erect,...
Mirror Equation   1 = 1 + 1 or di = f x do    f do di                do – f   f is the focal length   do is the object ...
Mirror Equation Rules   di is positive for real images, negative for virtual    images   hi is positive for erect images...
Convex mirror          reflects light off the           outer surface          images are always virtual,           erec...
Lens   transparent material with a refractive index    larger than air   The focal length of the lens depends on the    ...
Convex Lens   Convex lens - (converging lens) thicker in the    middle than at the edges; acts like a concave    mirror....
Convex Lens Characteristics                 Outside 2f, image is real,                  inverted, and smaller
Convex Lens Characteristics                 At 2f, image is real,                  inverted, and same size
Convex Lens Characteristics                 Between 2f and f, image                  is real, inverted, and              ...
Convex Lens Characteristics                 Inside f, image is virtual,                  erect, and larger
Concave lens         (diverging lens) thinner          in the middle than at the          edges          acts like a con...
Lens Equation Rules   The equation and rules stay the same except f is    positive for convex lens and negative for    co...
Corrective Lenses
Near-Sighted People   have too short a focal length   correct this using a concave (diverging) lens
Far-Sighted People   have too long a focal length,   correct this using a convex (converging) lens
Upcoming SlideShare
Loading in …5
×

Mirrors and lenses

1,751 views

Published on

Ch 18 Notes

Mirrors and lenses

  1. 1. Ch 18Mirrors and Lenses
  2. 2. Plane Mirror  flat, smooth surface that reflects light in a regular way;  it produces an image that is virtual, erect, and the same size as the object;  left and right appear to be interchanged, but front and back are interchanged
  3. 3. Types of Images Real image - source of converging light rays; can be projected; are always inverted Virtual image - source of diverging light rays; cannot be projected; are always erect
  4. 4. Concave Mirror reflects light off its inner surface Focal point - (f) point on the principle axis where reflecting light converges; f equals one-half the radius of curvature (C)
  5. 5. Spherical Aberration defect of all spherical mirrors when the parallel rays don’t all reflect through the focal point; correct this by using a parabolic mirror
  6. 6. Concave Mirror Characteristics  If the object is outside C, the image is real, inverted, and smaller
  7. 7. Concave Mirror Characteristics  If the object is at C, the image is real, inverted, and the same size
  8. 8. Concave Mirror Characteristics  If the object is between C and f, the image is real, inverted, and larger
  9. 9. Concave Mirror Characteristics  If the object is inside f, the image is virtual, erect, and larger
  10. 10. Mirror Equation 1 = 1 + 1 or di = f x do f do di do – f f is the focal length do is the object distance di is the image distance magnification - the ratio of the image size (hi) to the object size (ho) m = hi = - di ho do
  11. 11. Mirror Equation Rules di is positive for real images, negative for virtual images hi is positive for erect images, negative for inverted images f is positive for concave mirrors, negative for convex mirrors
  12. 12. Convex mirror  reflects light off the outer surface  images are always virtual, erect, and smaller  these are used as safety mirrors because you get a wider angle of vision
  13. 13. Lens transparent material with a refractive index larger than air The focal length of the lens depends on the shape and refractive index of the material
  14. 14. Convex Lens Convex lens - (converging lens) thicker in the middle than at the edges; acts like a concave mirror. Chromatic aberration - caused when light passes thru the edge of a lens; the light is dispersed; correct using an achromatic lens
  15. 15. Convex Lens Characteristics  Outside 2f, image is real, inverted, and smaller
  16. 16. Convex Lens Characteristics  At 2f, image is real, inverted, and same size
  17. 17. Convex Lens Characteristics  Between 2f and f, image is real, inverted, and larger
  18. 18. Convex Lens Characteristics  Inside f, image is virtual, erect, and larger
  19. 19. Concave lens  (diverging lens) thinner in the middle than at the edges  acts like a convex mirror.  Always produces virtual, erect, and smaller image
  20. 20. Lens Equation Rules The equation and rules stay the same except f is positive for convex lens and negative for concave lens
  21. 21. Corrective Lenses
  22. 22. Near-Sighted People have too short a focal length correct this using a concave (diverging) lens
  23. 23. Far-Sighted People have too long a focal length, correct this using a convex (converging) lens

×