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Author Question: Two very thin lenses, each with focal length 20. cm, are placed in contact. What is the focal length ... (Read 86 times)

Mimi

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on: Jul 27, 2018
Two very thin lenses, each with focal length 20. cm, are placed in contact. What is the focal length of this compound lens?
 
  A) 15. cm
  B) 10. cm
  C) 30. cm
  D) 40. cm
  E) 20. cm

Question 2

How much energy is carried by a photon of wavelength 660. nm?
 
  A) 1.46  10-48 J
  B) 3.01  10-19 J
  C) 6.63  10-34 J
  D) 5.39 eV
  E) 4.78  10-19 eV


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srodz

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


Mimi

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  • Posts: 542
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

tranoy

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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