Thank you so much! You are the best! I am preparing to enter university and this is one of the topics I will be tested in. I wish there were more people like you!
Thank you so much for these videos! If you take a look at 4:03 in the video, I think a simpler way to describe that angle is as follows: -we know theta1 is 45 degrees -theta1 and the angle opposite to it are...well "opposite angles" therefore they are equal -the angle we are interested in finding is simply the opposite angle - theta2 :) Thanks again for your videos, you're an amazing lecturer. I especially like all the little hints and explanations you do, my professors would simply assume we knew ALL math we ever used in physics and they would PURELY teach physics. I like how you actually EXPLAIN how you find your angles and such, it really helps!
ajarshiddiq7283 Yes you are correct. You start at the entry point, determine the refracted angle at the first entry and then use geometry to determine the angle of incidence at the second boundary.
This is very helpful but I think the answer to the last refraction angle is 25.81 ( my calculation without rounding any number) ~ 25.85 (follow your calculation) degree. The difference is only 0.04 degree. 25.6 is a little bit too low, isn't it? Please nevermind! Thank you very much for your lessons!
Could you please explain how you knew that the angle of incident light in n1 was 'parallel' with the normal at the n3-n4 boundary? Do you assume that this is a right angled prism? How do you know that theta3 = 45' - theta2? I apologise if I've misunderstood a step.
I can see that the first angle is an alternate angle with the 45 degree angle, but if it is not explicitly stated in some way, how can I assume they are alternate?
I just want to know how to work out that the 2 lines you stated are parallel at the start of the solution (the incoming light ray and the base of the triangle) are indeed parallel?
Hello Michel, I was wondering if it matters whether you use 1.5 or 1.6 as the index of refraction for glass. I saw that you used 1.6 in the previous example but for this one you used 1.5
+Orlando Castillo The index of refraction for glass is not a specific constant, but depends on the type of glass. It varies between 1.5 and 1.6 and also changes with the different colors of light.
Because the opposite sides are not parallel to one another. If you change the direction of the left side, you can see how that will affect the angle on the other side.
That is a good idea. We'll work on that. (Note that it takes a while before we can get any new videos out, but we'll place it at the top of the queue.)
If a ray goes across an interface perpendicular to the interface, it will not refract (bend) and continue in the same direction until it reaches the next interface.
Thank you so much, may I HAVE YOUR E-MAIL? It would be nice if you helped understand many things by answering diffirent questions about PHYSICS, THANK YOU :D
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Thank you so much! You are the best! I am preparing to enter university and this is one of the topics I will be tested in. I wish there were more people like you!
Thank you so much for these videos! If you take a look at 4:03 in the video, I think a simpler way to describe that angle is as follows:
-we know theta1 is 45 degrees
-theta1 and the angle opposite to it are...well "opposite angles" therefore they are equal
-the angle we are interested in finding is simply the opposite angle - theta2 :)
Thanks again for your videos, you're an amazing lecturer. I especially like all the little hints and explanations you do, my professors would simply assume we knew ALL math we ever used in physics and they would PURELY teach physics. I like how you actually EXPLAIN how you find your angles and such, it really helps!
You is amazing. My name is mark and I am from egypt and you help me to know the refraction of light lesson. thank you very much you is the best
+Mark football
Thank you for the comment. It is great to hear from students around the world. Keep up your studies.
So to find an angle at theta 4, you need to work sequentially from the theta 1 angle first using Snellen's law and assisted by triangle formulas.
Bisa dijelaskan lebih detail fajar
ajarshiddiq7283 Yes you are correct. You start at the entry point, determine the refracted angle at the first entry and then use geometry to determine the angle of incidence at the second boundary.
Thank you for the comment. I appreciate it.
You are welcome. Glad it helped.
Thank you so much for for this thorough explanation. Found it just in time.
Glad it was helpful! And glad you found our videos. 🙂
Very nice explanation
Thanks!
This is very helpful but I think the answer to the last refraction angle is 25.81 ( my calculation without rounding any number) ~ 25.85 (follow your calculation) degree. The difference is only 0.04 degree. 25.6 is a little bit too low, isn't it?
Please nevermind! Thank you very much for your lessons!
You are correct. (My eye sight isn't as good as it used to be and I sometimes miss read the numbers). Thanks for the clarification.
God bless you!!
do you want to know how much i learned ftrom you?
I can't count.
I learned engineering physics 2,3 from you...
I owe you!!!
thank you very much for the video but I asked where did 1,5 come from? Thank you very much sir in advance
That is a given. The index of refraction of glass varies from about 1.5 to about 1.6
appreciated to a great degree
casual pun XD
Thank you very much sir...all the way from Papua New Guinea..Port Moresby
Wow, that is a long ways from our house. Welcome to the channel!
this has been of great help to me.
Thank you so much ..that helped me a lot
ur student from Egypt :)
+I7san_ INDT Greeting to Egypt. Welcome to the channel.
Amazing explanation thank you!
Thank you. Glad you found it helpful! 🙂
Thnk you so much sir..❤
Most welcome
I understand 70%. I forgot I knew about alternate interior angles...
Could you please explain how you knew that the angle of incident light in n1 was 'parallel' with the normal at the n3-n4 boundary? Do you assume that this is a right angled prism? How do you know that theta3 = 45' - theta2? I apologise if I've misunderstood a step.
I should have listened to the end. You eventually mentioned at 7:00 that you assumed this was a right angled prism.
I can see that the first angle is an alternate angle with the 45 degree angle, but if it is not explicitly stated in some way, how can I assume they are alternate?
What do you mean by: "the first angle is an alternate angle with the 45 degree angle"?
I just want to know how to work out that the 2 lines you stated are parallel at the start of the solution (the incoming light ray and the base of the triangle) are indeed parallel?
Yes, the incoming ray and the base of the prism are parallel
Hello Michel, I was wondering if it matters whether you use 1.5 or 1.6 as the index of refraction for glass. I saw that you used 1.6 in the previous example but for this one you used 1.5
+Orlando Castillo
The index of refraction for glass is not a specific constant, but depends on the type of glass. It varies between 1.5 and 1.6 and also changes with the different colors of light.
Hi! thanks for the video, there's only one thing that isn't clear to me, why theta 3 is different from theta 2? why the angle changes?
Because the opposite sides are not parallel to one another. If you change the direction of the left side, you can see how that will affect the angle on the other side.
Michel van Biezen That's amazing, thanks a lot!!
can you use spells law to find theta 3 instead of getting it by using geometry?
snell's law*
@@jacquelineescava9899 No, you have to work through the geometry to find angle 3. (Try it and you'll see).
Sir please upload a video explaining how to calculate angle of Daviation and apex angle. that would be so kind of you. thanks
That is a good idea. We'll work on that. (Note that it takes a while before we can get any new videos out, but we'll place it at the top of the queue.)
what if a light ray was traveling from the right side into the vertical surface of a glass prism?
If a ray goes across an interface perpendicular to the interface, it will not refract (bend) and continue in the same direction until it reaches the next interface.
Thanks a lot!
really helpful
Heartfelt thanks :)
Thank you so much sir! I love your bow tie :D
Thank You Very Much This Really Helped, Thumbs Up :)
What level is this tutorial series
This is last year high school or first year college.
Michel van Biezen Thanks I find this tutorial really helpful
thank u very much.
And that's all I have to say about that
You made my face hurt.
take another angle in the beginning and another prism this is lame... but good explanation
Thank you so much, may I HAVE YOUR E-MAIL? It would be nice if you helped understand many things by answering diffirent questions about PHYSICS, THANK YOU :D
if the angle is equal to 45 degree it'll be too easy
3iach ta3 miricane
🥰🥰🥰
Thank you. Glad you lked it.
zy66
Thanks a lot!