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PRACTICE / Thin lenses

A virtual image has a signed position

A real object is 0.30 m left of a diverging lens with focal length −0.15 m. Light travels left to right.

Find the signed image position v.

Organize the givens & assumptions
  • u = −0.30 m
  • f = −0.15 m

Thin paraxial lens in air; Cartesian distances positive rightward; real object at u = −0.30 m and f = −0.15 m.

  1. A−0.30 m-0.30\ \mathrm m
  2. B+0.30 m+0.30\ \mathrm m
  3. C−0.10 m-0.10\ \mathrm m
  4. D+0.10 m+0.10\ \mathrm m

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