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Author Question: The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be ... (Read 88 times)

tichca

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  • Posts: 554
on: Jul 29, 2018
The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be used to move the near point to 25 cm from this person's eyes?
 
  A) 2.8 diopters
  B) -2.8 diopters
  C) -4.0 diopters
  D) -4.2 diopters
  E) 4.2 diopters

Question 2

A man is nearsighted and cannot see things clearly beyond 110from his eyes. What is the focal length of the contact lenses that will enable him to see very distant objects clearly?
 
  A) 50 cm
  B) -50 cm
  C) -110 cm
  D) 110 cm
  E) -30 cm

Question 3

A nearsighted physicist cannot see things clearly beyond 90 cm from her eyes. What is the power of the contact lenses that will enable her to see very distant objects clearly?
 
  A) 1.1 diopters
  B) -1.1 diopters
  C) -1.7 diopters
  D) -2.2 diopters
  E) 2.2 diopters


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yahahah24021

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  • Posts: 323
Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

You just saved me a lot of time. ;)

Answer to Question 3

B


tichca

  • Member
  • Posts: 554
Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

Mochi

  • Member
  • Posts: 300
Reply 3 on: Yesterday
Gracias!

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