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Author Question: A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal ... (Read 143 times)

berenicecastro

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on: Jul 29, 2018
A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal length 5.0 cm as a magnifying glass. What is the magnification if the person's eye is relaxed (with the image at his far point)?
 
  What will be an ideal response?

Question 2

What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm?
 
  A) -60 cm
  B) -30 cm
  C) +30 cm
  D) +60 cm
  E) +130 cm

Question 3

A person can read the newspaper when it is held at 60 cm from his eyes. What should the focal length of his contact lenses be to allow him to read the newspaper comfortably at a distance of 30 cm?
 
  A) -30 cm
  B) 30 cm
  C) -60 cm
  D) 60 cm
  E) 90 cm


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Beatricemm

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

5.0 x

Answer to Question 2

You just saved me a lot of time. ;)

Answer to Question 3

Here to give you a feedback, your answer was right Awesome


berenicecastro

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Reply 2 on: Jul 29, 2018
Gracias!

milbourne11

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Reply 3 on: Yesterday
Excellent

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