Diffraction Grating: What's It Called?

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The discussion centers on a diffraction experiment that utilized single slits, double slits, and a unique diffraction grating described as "criss-crossed." This specific grating did not produce dark fringes in the interference pattern, prompting a request for its proper name to facilitate further research. Participants are encouraged to provide additional descriptions or insights regarding this type of grating and its resulting diffraction pattern. The absence of dark fringes is a key point of confusion, indicating a need for clarification on the phenomenon. Understanding this unique grating could enhance comprehension of diffraction patterns in optics.
kash25
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"Diffraction Grating"

We did a diffraction experiment involving single slits, double slits, and a diffraction grating. Apparently the diffraction grating that we got was "different" (according to a classmate). The diffraction grating was "criss-crossed" and didn't produce any dark fringes on the interference pattern.
Can anyone tell me what one of these criss-crossed gratings is called so that I can figure out (i.e. Google) what the diffraction pattern would look like?
Thank you!
 
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Can you give any other description other than that? I am stumped!
 
All I know is that the diffraction pattern somehow had no dark fringes...
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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