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Author Question: What power contact lens must be used to correct the vision of a nearsighted person whose far point ... (Read 140 times)

ts19998

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on: Jul 29, 2018
What power contact lens must be used to correct the vision of a nearsighted person whose far point is 40 cm?
 
  A) 2.5 diopters
  B) -2.5 diopters
  C) -3.6 diopters
  D) -4.0 diopters
  E) 4.0 diopters

Question 2

The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
 
  A) f/4.0
  B) f/2.0
  C) f/5.6
  D) f/0.30
  E) f/0.40


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laurnthompson

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Thank you soo much

Answer to Question 2

A


ts19998

  • Member
  • Posts: 531
Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

diana chang

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Reply 3 on: Yesterday
Wow, this really help

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