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Author Question: A CD player uses a laser with wavelength 900 nm. If the CD has a plastic coating with index 1.50, ... (Read 92 times)

moongchi

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on: Jul 28, 2018
A CD player uses a laser with wavelength 900 nm. If the CD has a plastic coating with index 1.50, what is the wavelength in the plastic?
 a. 600 nm
  c. 1350 nm
  b. 500 nm
  d. 750 nm

Question 2

A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m, the image being projected on film at a distance of 46 cm from the pinhole. What are the height and orientation of the image?
 a. 3.5 cm, upright
  c. 12 cm, upright
  b. 3.5 cm, inverted
  d. 12 cm, inverted


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Viet Thy

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Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

B


moongchi

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Reply 2 on: Jul 28, 2018
Thanks for the timely response, appreciate it

nguyenhoanhat

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Reply 3 on: Yesterday
:D TYSM

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