Need help understanding ray optics question

AI Thread Summary
The discussion centers on a ray optics question regarding light behavior through a slit and an aperture. The main point is that the aperture blocks all light except for the straight rays passing through the slit, leading to the conclusion that the answer is C. It is noted that while diffraction occurs, there is no interference pattern due to the lack of coherent light. Additionally, the orientation of the lamp bulb is highlighted as a factor in understanding the resulting image on the screen. The conclusion emphasizes the significance of the aperture's role in shaping the light pattern observed.
Woah_Moses
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Homework Statement


http://i.imgur.com/q6EaspT.png
2. The attempt at a solution
why is the answer C? shouldn't the aperture in front of the screen create a shadow that blocks all the light except the rays that go through slit? (the width of the slit is >>>1mm so it won't make a diffraction pattern.)
 
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You will get diffraction through the slit but no interference pattern because the light is not coherent.
 
The answer is C , BECAUSE the aperature blocks all light except the (straight, essentially not diffracted) rays that pass thru the slit.
Did you notice that the lamp bulb was horizontally long (rather than tall)?
[that is, what would a "point source" look like on the screen? ...]
 
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