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MMLU-Pro / 9194 / A man has a concave shaving mirror whose focal. length is 20 in. How far should…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A man has a concave shaving mirror whose focal. length is 20 in. How far should the mirror be held from his face in order to give an image of two-fold magnification?

category

physics

options

  1. 8 in.
  2. 25 in.
  3. 10 in.
  4. 40 in.
  5. 5 in.
  6. 12 in.
  7. 30 in.
  8. 35 in.
  9. 15 in.
  10. 20 in.

src

stemez-Physics

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