Thin lens and mirror sign conventions

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7 Terms

1
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convex lens

  • object distance is greater than f length

  • focal length (+)

  • image distance (+)

  • real, inverted, behind lens

  • object distance > 2f: then reduced

  • object distance = 2f: then same size

  • f < object distance < 2f: then magnified

2
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concave mirror

  • object distance is greater than f length

  • focal length (+)

  • image distance (+)

  • real, inverted, in front of mirror

  • object distance > 2f: then reduced

  • object distance = 2f: then same size

  • f < object distance < 2f: then magnified

3
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concave mirror and convex lens

  • object distance is equal to f length

  • focal length (+)

  • image distance (0)

  • no image

4
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concave mirror

  • object distance is less than f length

  • focal length (+)

  • image distance (-)

  • virtual, upright, behind mirror

  • magnified

5
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convex lens

  • object distance is less than f length

  • focal length (+)

  • image distance (-)

  • virtual, upright, in front of the lens

  • magnified

6
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concave lens

  • focal length (-)

  • object distance can be less than, equal to, or greater than focal length

  • image distance (-)

  • virtual, upright, in front of the lens

  • reduced

7
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convex mirror

  • ocal length (-)

  • object distance can be less than, equal to, or greater than focal length

  • image distance (-)

  • virtual, upright, behind mirror

  • reduced