Snell's Law Puns

Freshman Valencia student on UCF engineering pathway. Need help learning how to design simple line lenses. Looking for someone versed in optics.

Question 1: I was watching a video explaining snells law and they derived the formula by assuming light is lazy and would bend because it travels the shortest distance from point A to point B, and not actually bending due to the properties of the medium. To me this sounds eerily close to an analogy of the equivalence principle because it seems like light is telling the material what properties to have rather than light moving due to the property of the material. Is there any substance to this at all or not really?

Question 2: whenever someone asks what happens for special relativity if we try to take the frame of reference of a particle moving at the speed of light, they are always answered with a dismissive "that doesn't make sense and is irrelevant or it doesn't exist" or something that doesn't really answer the question. Because I feel like we can completely imagine what would happen if we assume we are a photon. What would we see? how would other photons look to us? I know if you plug it into the lorentz transform the denominator blows up to infinity but to me it always seemed like a failure in the theory rather than a true singularity. So whats happening here?

Question 3: Whenever someone talks about "is space/time infinitely divisible" they always go to the uncertainty principle and say that because we can't measure it without creating a black hole, the plank length/time is the smallest relevant length. But to me that always seemed like a cop out because space or time shouldn't actually care if we can measure it or not. just because we can't theoretically measure something smaller than a plank length, doesn't mean it doesnt exist and that space can't be infinitely divisible. The universe doesn't exactly cater to what we can and can't measure, right? Unless the uncertainty principle actually has a meaning thats a lot more fundamental to the universe.

Question 4: I am having a hard time grasping at the cosmological constant and Hubbles expansion of the universe. Because we know that a depends on t but I thought time had no meaning because it was all relative.

Question 5: should we actually model our observable universe as a closed system with no energy exchange? Because since space itself is expanding and galaxies eventually move away from us faster than the speed of light, then what we observe becomes less and less, but also those galaxies and energies effectively leave our universe because we can no longer interact with them (causality due to sp

It has been a year of me searching for an intuitive proof for snells law and i found this video

Could someone watch it and verify somethung for me

I understand everything except for one thing

Feemats principle makes no sense in lroving here. Cos fermats principle states that light takes tte shortest distance. However when doing the proof A and B are predetermined. Light doesnt decide where its gonna end up before it moves. Please explain Aftrr these two questions are anwered i will fully understand snells law

https://youtu.be/8wYkgZKboss

Question is about finding speed of light in aqueous humour, if light hits the eye at 11 degrees, refracts to 15 degrees. I am given sin theta for each (0.19 and 0.26 respectively)

My textbook has an equation that is a combination of Snell's Law and n=C/V

My question is: Why can't I solve this using snell's law initially (to find n2), then plug that value into n=C/V. The correct answer is 2.4*10 to the 8 (sorry I don't know how to format these numbers). I don't get anything close to that answer when I do it the 2 step way.

When a ray of light is described as being "incident upon a glass plate at an angle of 30", is the 30 degrees referring to the angle between the ray and the normal line or the ray and the horizontal surface?

I ask because I want to know if in any situation you would have to do 90*-30* to get 60* as the angle in the snells law equation.

*Also join us at r/FFIE to discuss everything FF-related!*

Source: FF Website, https://www.ff.com/us/futuresight/SnellsLaw/.

What exactly is Snell’s law? And why is an electric car company interested in its dynamics? Snell's law (also known as Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.  The law is used in optical ray tracing to compute the angles of incidence or refraction and in experimental optics to find the refractive index of a material.

Faraday Future (FF), recently introduced the concept of the “Third Internet Living Space,” the conduit between one’s home and destination (office, school etc.)  Part of this “space” is the benefit of connectivity, and part of it is the fact that FF 91 boasts as many as 11 screens throughout its interior.

We want to bring this Third Internet Living Space to our users and ensure that any potential issues of this space are eliminated.  One of our passenger features that we are proud to introduce in the FF 91 is an industry-leading large 17” display up front.

A lot of consideration was taken with putting this display into the car, including addressing challenges of the display being washed out in a bright environment or the display not being bright enough to be legible. One challenge we faced that is unique to the FF 91 design is preventing the display image from being reflected off the windshield.

As the display is placed further to the front of the car, the chance of its image being reflected off the windshield increases.  Especially in a dark environment, this could be very distracting to the driver or passenger. Below, you can see how that image in the passengers viewing area is affected.

Most automobile manufactures avoid this challenge by using one of three solutions:

1. Placing a hood-shaped object above the display. This can be evident in most cars instrument cluster. Essentially, this blocks the light path of the display to the windshield. However, this limits the design, increases the weight and limits the potential location of the display. In the image below, a hood is shown in front of the steering wheel and above the instrument cluster display.
2. Placing the display farther “back”

Or point me to a sub that might have some people who know how to?

I'm really struggling it tbh, I have the equation, but I have no idea what "n" actually is, or how to apply the equations to figuring out any properties of the medium the light is going through. I've tried looking it up on my own but it's just so confusing

Hi all - I'm very new to programming, and have been recently introduced to it via my Instrumental Analysis course.

My current assignment is to find and graph the angle of refraction given refractive index values of two different materials.

I got pretty far in my code, but it won't run a graph for me. I attached a picture of what I'm trying to achieve also.

Here's my code:

%This code calculates the value for the angle of refraction from all values of

%the angle of the incident ray from 0 to 90 degrees, given the refractive

%index of two different media

%This code was written by KER October 8, 2020

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

n1=1.5;

n2=1.8;

ti=linspace(0,1,pi/2);

tr=asin((n1*sin(ti))/n2);

%TIR happens when the ti is larger than the critical angle.

%the critical angle is when tr is equal to 90 degrees.

%using snells law n1sin(ti)=n2sin(90) which can be simplified to

%n1sin(ti)=n2*1,

%total internal reflection will happen when (n1/n2)sin(t1)>1.

if((n1/n2)*sin(ti))>1

fprintf('error: Total internal reflection occurs because ti is > critical angle. no light enters region 2');

end

mywave=zeros(91,1);

for ti=0:1:90

mywave(tr+1,1)=asin((n1*sin(pi*ti/180))/n2);

end

Can anyone tell me what I'm missing?

Thanks in advance

Hi, how can Snell's Law be used to find θ here? I thought θa and θb would be the angles I circled in red, and neither of those are θ (the angle along BC).

Also, it's given that n_glass = 1.52.

I am new to posting on reddit in general, so please do tell me if I do anything wrong.

Whilst I was doing research on how Maxwell’s equations could explain why light bends, I encountered a bit of a problem in my understanding. To my understanding, the reason that light bends when going from air to glass is that, using the boundary conditions, the magnitude of the vertical component of the electric field is affected by the ratio of refractive indexes.

However, the other 2 boundary conditions indicate that the magnetic fields pass through without changing. But since the E and B fields need to remain perpendicular at all times(?), then it doesn’t quite make sense to me how it is possible that the magnetic fields don’t change both vertically and horizontally, but then somehow end up bending along with the electric fields too.

Could anyone clarify what I am missing here? I’m really sorry if the question is unclear.

Thank you :)

I'm sorry for the spelling but I don't speak English so I trust in google translate.

What is the explanation for this?

Hello! I'm struggling with understanding the derivation of the Bragg-Snell law, im hoping someone can help me.

I can't find a derivation online that goes through the combination of Snell and Braggs law to get the result. Closest ive gotten is this

https://pdfs.semanticscholar.org/76aa/f88652c1930feca1fcd8a912087736595ecb.pdf

page 110 . I follow everything except equation 5.3 - where did that cos(phi) come from? Shouldnt it be Sin(phi) ? But then its used later on. If anyone has another derivation that would be great too :D

Graph here

https://preview.redd.it/ce2q2r4b4t631.png?width=800&format=png&auto=webp&s=e4bec86cc71b36e36a26dd5931823a1af9b0b553

Source: FF Website, https://www.ff.com/us/futuresight/SnellsLaw/.

What exactly is Snell’s law? And why is an electric car company interested in its dynamics? Snell's law (also known as Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.  The law is used in optical ray tracing to compute the angles of incidence or refraction and in experimental optics to find the refractive index of a material.

Faraday Future (FF), recently introduced the concept of the “Third Internet Living Space,” the conduit between one’s home and destination (office, school etc.)  Part of this “space” is the benefit of connectivity, and part of it is the fact that FF 91 boasts as many as 11 screens throughout its interior.

We want to bring this Third Internet Living Space to our users and ensure that any potential issues of this space are eliminated.  One of our passenger features that we are proud to introduce in the FF 91 is an industry-leading large 17” display up front.

A lot of consideration was taken with putting this display into the car, including addressing challenges of the display being washed out in a bright environment or the display not being bright enough to be legible. One challenge we faced that is unique to the FF 91 design is preventing the display image from being reflected off the windshield.

As the display is placed further to the front of the car, the chance of its image being reflected off the windshield increases.  Especially in a dark environment, this could be very distracting to the driver or passenger. Below, you can see how that image in the passengers viewing area is affected.

Most automobile manufactures avoid this challenge by using one of three solutions:

1. Placing a hood-shaped object above the display. This can be evident in most cars instrument cluster. Essentially, this blocks the light path of the display to the windshield. However, this limits the design, increases the weight and limits the potential location of the display. In the image below, a hood is shown in front of the steering wheel and above the instrument cluster display.
2. Placing the display farther “back” in the car. This technique is used mostly for center information displays. Displays placed fart