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yikang_xu4881
Joined: 23 Apr 2007
Posts: 10
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 Posted: Sat Aug 11, 2007 7:20 pm Post subject: Question 20 |
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the question asks about ?2 and ?3, but the answer deals with ?1 and ?2?
is that right? |
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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
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| Posted: Wed Aug 15, 2007 11:40 pm Post subject: |
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| The reason for that is that theta 1 approximates theta 2 which in turn approximates theta 3. This should have been explained more clearly. The explanation has been updated to clarify this point. |
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sleepyzboy2302
Joined: 21 Mar 2010
Posts: 11
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| Posted: Sun May 23, 2010 8:58 pm Post subject: |
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| How did you relate the wavelength of red light to L? |
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 413
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| Posted: Mon May 24, 2010 9:31 am Post subject: |
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| The truth is, had we not said anything, you would have already assumed that the movement of light (the laser) can be approximated by straight lines. Nonetheless, we just wanted to give the proof as to why that approximation is valid. It is valid because the wavelength of the red light (laser, 632 nM; recalling the very first sentence of the passage saying that it is red) is far less than the distance L (>10 m). |
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Inkoate
Guest
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| Posted: Thu Jun 23, 2011 10:29 am Post subject: |
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| I thought since Y1 was greater than Y2, theta 2 would be larger than theta 3. Also, I never knew that the wavelength and the length to the screen had anything to do with theta. I thought that wavelength and height of the slit opening affected the spreading of light. I didn't think length did also. Is there some formula we were supposed to know to answer this question? |
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