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Author Question: A person is nearsighted with a far point of 75.0 cm. (a) What focal length contact lens is needed ... (Read 90 times)

hbsimmons88

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on: Jul 29, 2018
A person is nearsighted with a far point of 75.0 cm.
  (a) What focal length contact lens is needed to give him normal vision?
  (b) What is the power of the corrective lens?
 
  What will be an ideal response?

Question 2

An ideal transformer steps down 120 V to 12. V and the 2630.-turn secondary supplies 12. A.
 
  (a) Determine the current in the primary.
  (b) Determine the turns ratio.
  (c) What is the ratio of output power to input power?


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Ksanderson1296

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

(a) -75.0 cm (b) -1.33 diopters

Answer to Question 2

(a) 1.2 A (b) 1.0:10. (c) 1:1 for ideal transformer


hbsimmons88

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


Ksanderson1296

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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