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# The Physics PHYA2 thread! 5th June 2013 watch

• View Poll Results: What mark do you think you got out of 70?
0-20
6
3.00%
21-40
12
6.00%
41-50
29
14.50%
51-60
79
39.50%
61-70
74
37.00%

1. (Original post by StalkeR47)
Yes! So, if only 1 criteria is met, only refraction takes place. Am I right?
But that's what we were saying all along! We were saying if both criteria is not met TIR does not take place!!
You were the one saying that as long as one is met TIR can take place
2. (Original post by StalkeR47)
Yes! So, if only 1 criteria is met, only refraction takes place. Am I right?
Exactly so both criteria's have to be met. You just proved what we've been saying
3. (Original post by Raimonduo)
In simpler terms, for TIR to occur:

Not greater than OR equal to. If it is equal to the crit angle then it will refract along the boundary perpendicular to normal.
4. (Original post by Qari)
Exactly so both criteria's have to be met. You just proved what we've been saying
I know right!
I think he/she was a little confused tbh.
5. (Original post by NabRoh)
To be fair the waves was one was very easy so expect a harder 6 marker.
agreed, formation of a stationary wave is not that difficult to remember once you learn the key parts of it.

Reckon they could ask for an experiment to determine acceleration due to gravity?

Or maybe something on optic fibres discussing the principle features and how they work... idk
6. (Original post by x-Sophie-x)
I actually thought so too, but StalkeR47 has a point.
Have you had a looked at Question 6 on June 2009?
i haveee !!! and it is agreeing with mee. the cladding's refractive index is less than core CHECK !! BUTTTTTT 60degrees is less than 69.3degrees (critical angle) UNCHECK !! therefore you dont get T.I.R. hence it refracts. this means both HAVE to occur for T.I.R
7. (Original post by x-Sophie-x)
I get you! yaaaay!

Thank you so much!
No probs and thanks for understanding my point! I think it works like this. When You meet 1 criteria(of TIR) and not the other, refraction occurs. When you meet both criteria(of TIR), TIR occurs. when you meet no criteria(of TIR), still refraction occurs. Am I right?
8. (Original post by Qari)
Trust us both have to occur
Damnnn

Wait, I see. I'm trying to look at the question to closely.
Basically that question doesn't confirm anything, because when both conditions are not true it doesn't TIR.

I believe you (I think)
9. (Original post by StalkeR47)
No probs and thanks for understanding my point! I think it works like this. When You meet 1 criteria(of TIR) and not the other, refraction occurs. When you meet both criteria(of TIR), TIR occurs. when you meet no criteria(of TIR), still refraction occurs. Am I right?
Yes, Hallelujah
10. (Original post by StalkeR47)
Yes! So, if only 1 criteria is met, only refraction takes place. Am I right?
exactly broo thats what we have been trying to say !!! and you got sophie to think of it in the wrong way
11. (Original post by StalkeR47)
No probs and thanks for understanding my point! I think it works like this. When You meet 1 criteria(of TIR) and not the other, refraction occurs. When you meet both criteria(of TIR), TIR occurs. when you meet no criteria(of TIR), still refraction occurs. Am I right?
Yep, see I thought you meant if only one criteria was met then TIR still happens, hence my confusion!
12. (Original post by StalkeR47)
No probs and thanks for understanding my point! I think it works like this. When You meet 1 criteria(of TIR) and not the other, refraction occurs. When you meet both criteria(of TIR), TIR occurs. when you meet no criteria(of TIR), still refraction occurs. Am I right?
had to rep your post there ! got me to calm down knowing you finally understood what we meant phew !! loool
13. (Original post by x-Sophie-x)
Yep, see I thought you meant if only one criteria was met then TIR still happens, hence my confusion!
So do you understand that both have to be met for TIR to occur
14. (Original post by masryboy94)
exactly broo thats what we have been trying to say !!! and you got sophie to think of it in the wrong way
No! All I was saying that why TIR does not occur if incident substance has larger refractive index than the other? Can you answer this? HUH?
15. (Original post by NabRoh)
Not greater than OR equal to. If it is equal to the crit angle then it will refract along the boundary perpendicular to normal.
there is partial diffraction internally at the critical angle that they sometimes want you to draw on as a dotted line. The main ray is along the boundary.

I reckon we might get a single slit diffraction 6 Marker but i can't think of 6 seperate points.
16. (Original post by masryboy94)
i haveee !!! and it is agreeing with mee. the cladding's refractive index is less than core CHECK !! BUTTTTTT 60degrees is less than 69.3degrees (critical angle) UNCHECK !! therefore you dont get T.I.R. hence it refracts. this means both HAVE to occur for T.I.R
I KNOW! Omg, why am I so easily persuaded, this is awful D:

Just re looked at it and I see what he was trying to say, but yeah you're right, and I get it
Thanks
17. (Original post by Qari)
So do you understand that both have to be met for TIR to occur
No! All I was saying that why TIR does not occur if incident substance has larger refractive index than the other? Can you answer this? HUH? same question.
18. (Original post by StalkeR47)
No! All I was saying that why TIR does not occur if incident substance has larger refractive index than the other? Can you answer this? HUH?
The incident angle would be lower than the Critical angle
19. (Original post by Qari)
The incident angle would be lower than the Critical angle
20. (Original post by Goods)
there is partial diffraction internally at the critical angle that they sometimes want you to draw on as a dotted line. The main ray is along the boundary.

I reckon we might get a single slit diffraction 6 Marker but i can't think of 6 seperate points.
At least 1 mark on definition/equation

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