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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 93 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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Reply 2 on: Jul 27, 2018
Wow, this really help

miss_1456@hotmail.com

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Reply 3 on: Yesterday
Gracias!

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