How to draw reflected wavefronts with a protractor

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Physical_Fire
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How would one draw reflected wavefronts? I do not get this concept. I have attached a question below, and I do not necessarily ask anyone to solve this but teach me on how to provided that I have a protractor, a pencil and a ruler.

Thanks
 
Attachments
  • Diagram of parallel wavefront lines in air, slanted, meeting a horizontal air-glass boundary at the bottom; an arrow labelled direction of travel of wavefronts points down toward the glass; labels air above and glass below the boundary.
    1690635834444.png
    21.3 KB · Views: 176
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Physical_Fire said:
How would one draw reflected wavefronts? I do not get this concept. I have attached a question below, and I do not necessarily ask anyone to solve this but teach me on how to provided that I have a protractor, a pencil and a ruler.

Thanks
I wonder if I'm understanding your question correctly.
This is an easy Google image search for "reflected wavefronts".
Here is a result for reflection:
Diagram of wave reflection off a barrier: incident waves and their wavefronts strike the barrier at angle θi from the dashed normal, and reflected waves and wavefronts leave at angle θr.

Here's refracted:
Diagram of a plane wave refracting at a horizontal boundary: blue parallel wavefronts above the line angle down into green wavefronts below, with a dashed ray arrow in each medium and yellow dots with circular wavelets along the boundary.
 
Can you draw the reflected ray? If so, the reflected wavefronts would be perpendicular to the reflected ray.
 
If I use that logic, it doesn't work here:
 
Attachments
  • Exam diagram of parallel wave crests angled toward a horizontal barrier at the bottom, with an arrow labelled direction of travel of wave pointing down toward the barrier and crest and barrier labelled.
    1690639731237.png
    6.2 KB · Views: 173
.Scott said:
I wonder if I'm understanding your question correctly.
I don't think so you did. I meant on how to draw in relation to the image I have attached.
 
Physical_Fire said:
I don't think so you did. I meant on how to draw in relation to the image I have attached.
Draw the mirror image of the attached image about a plane perpendicular to the reflecting surface.
 
Then, how do you reflect this one?
 
Attachments
  • Diagram of parallel wave crests angled toward a horizontal barrier at the bottom, with an arrow labelled direction of travel of wave pointing down toward the barrier and a label marking one crest.
    1690640628716.png
    6.2 KB · Views: 141
Physical_Fire said:
Then, how do you reflect this one?
The same way as shown in the top figure in post #2. What's your problem?
 
Please describe what you think those graphs are showing.
Tell us what you know about reflection and wave fronts.
Your questions appear to be profoundly elemental.
 
Time to close this thread as the OP has received some excellent answers and needs some time to ponder them.

Thank you all for contributing here.

Jedi
 

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