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Author Question: A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of ... (Read 105 times)

michelleunicorn

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on: Jul 29, 2018
A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
 
  A) infinite B) -30 cm C) 18 cm D) 38 cm E) -19 cm

Question 2

A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second?
 
  (h = 6.626  10-34 J  s, c = 3.00  108 m/s)
  A) 1.3  1016 B) 6.7  1015 C) 8.8  1015 D) 1.1  1016


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sultana.d

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

D

Answer to Question 2

B


michelleunicorn

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Reply 2 on: Jul 29, 2018
Wow, this really help

dawsa925

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

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