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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 107 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
Gracias!

ktidd

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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