What is the correct way to draw this internal reflection

AI Thread Summary
The discussion centers on the correct method for illustrating internal reflection, emphasizing that only one or zero additional reflections should occur after the initial reflection, and that the drawing must be symmetrical. Participants express concerns about the accuracy of a shared drawing, noting it does not adhere to the laws of reflection, particularly regarding the angles of incidence and reflection. There is debate over the validity of the mark scheme's answer, with some participants suggesting that it appears correct when assessed visually, while others stress the importance of precise drawing. The conversation highlights the need for careful adherence to reflection principles in creating accurate diagrams. Ultimately, the consensus is that any drawing must conform to the laws of reflection to be deemed correct.
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The answer is saying the following,

initial reflection + 0 or 1 further reflection only, not at lower surface

must be straight and reach within 1cm of end.
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How come 0 or 1 reflection only ? The length is long to take only one reflection!

I also attached a photo of how I think it should be drawn.

Thank you for your help!
 
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Looking at your drawing, it seems to me that the first reflection is not symmetrical.. Did you draw a Normal and get the angles i and r the same.? Your picture seems to bring the first reflection to hit the lower surface much too soon. I could believe the 'real answer' more than yours. (That third reflection of yours looks even worse.)
 
Actually this is not my drawing . I found it in the internet but this is exactly the way I have drawn too.
 
Well, it can't be right if it doesn't follow the laws of reflection, can it?
 
I agree. It doesn't follow the law of reflection !
 
So it's wrong. Draw it so it does follow the law and you should get the right answer. :wink:
 
What do you think about the asnwer in the mark scheme?
 
I can't be bothered to draw it out but it looks OK when I do it 'by eye'. Have you drawn it out carefully and do you disagree with it?
 

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