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Author Question: A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in ... (Read 72 times)

abern

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on: Jul 29, 2018
A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
 
  A) -2.8 cm
  B) 2.8 cm
  C) -2.4 cm
  D) 2.4 cm
  E) 2.2 cm

Question 2

Which of these lamps has no mercury content?
 
  A) fluorescent lamp
  B) CFL
  C) incandescent lamp
  D) none of the above


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6ana001

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

B

Answer to Question 2

Answer: C


abern

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


6ana001

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


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