Optics Definition and 999 Threads

Hi I have been trying to work these out over the last few days and can get part way through but not get to the final answer. So some help would be appreciated http://www.thephysicsforum.com/images/smilies/smile.png 1. An unpolarised light beam of 2mm diameter carrying 4mW of power passes...

Can somebody please explain how electron impact can cause optically forbidden transitions in atoms and molecules ?

Hi, I am a final year undergraduate student having to do a presentation for a course in 'Advanced Quantum Mechanics.' Our lecturer offered the following topics. I have to pick one of these. 1. Born-Oppenheimer Approximation → Berry Phase 2. Non-Hermitian Quantum Mechanics 3. Path...

So, I was reading about the exchange interaction, and trying to work out what it referred to, and came across something strange in the treatment of the hydrogen molecule (I think it was on wikipedia): The hamiltonian given for the system included a term e2/(4πε0 * Rab) for the repulsion between...

Homework Statement I am working on a lab report for a Microwave Optics lab in a Modern Physics class. There is a part in it where I am supposed to derive P_{avg} \propto 1 + cos(δ) . Here is the problem: The electric field of the signal reflected off the fixed mirror can be written as E_1 =...

I'm confused about optical low pass filters (found on CCD imaging devices). As I understand it is a double layer of birefringent material which in effect splits light into 4: (2*25%) green, 25% red, and 25% blue (for a standard bayer matrix). The part I'm not sure about is if all 4 fall on the...

Application: to measure the thermal strain of optical lens. Due to temperature variation the lens surface is expanding / contracting in radial direction with two extreme operating temperature. (-40C to +70C ) Optical lens is SF56A (CTE - 7.9*e-6 per Kelvin) What to do: I need to measure...

Given a racemic mixture with both isomers being optically active, why is it that light can still pass through? If I am not mistaken (this may be completely wrong): the two isomers of a compound, when optically active, polarize light in a plane perpendicular the other. (If this is wrong, please...

I'm looking for a "simple" calculator, most likely a matrix based thing, to allow me to work out the size of an image projected on the retina by an object of a given size some distance from the retina. being the eye, the thin film approximation is no good (i.e. if I have an object 3cm from the...

New to the forum but stumbled upon this and thought it might be beneficial to query more scientifically minded individuals. I am a filmmaker and use a variety of lenses to acquire certain looks. One of which is anamorphic cinematography. (http://www.red.com/learn/red-101/anamorphic-lenses)...

Hello everyone! I recently bought a small raspberryPi board, with its small "camera board". (link for camera reference) I want to use a CS lens on this camera (CS lens from the security camera industry). I have been able to attach the lens, and it focuses very good, yet not "excellent"...

Can anyone help me set this problem up? I am trying to figure out how to Prove the Sander's Parallelogram. See it here: http://www.tigel.nl/fun/files/opticals/Ill...ith_line-25.htm basically it is proving that the bisectors are of equal length The question is: what would be needed...

Good day, I'm starting my master in physics, and it's time for me to choose my courses. I've decided that I probably want to pursue the direction of quantum information processing, and I'm trying to pick my courses with that in mind. For my first semester I'll be taking four courses: Quantum...

Can anyone tell me how to convert electrical lan signals into optical signals for wireless transmission via LEDs like they use it Li-Fi systems.

I am self-studying Physics in the second year of my undergrad(too late i know) as I never really understood many basic concepts in my high school as clearly as i now do. In my enthusiasm to teach myself Physics I bought a number of books but none seem on par with stuff described on many forums...

Good Morning I loved the idea of four wave mixing in an optical fiber and how by satisfying phase matching condition you get a broad bandwidth but I want to know why am I interested in a large bandwidth why do I want to think about even enlarge it more? Thank you

Homework Statement i can't understand why the optical path diffrence is 2nt+0.5λ. why is it so? the 0.5λ is due to the path difference change of 180 degree of when it is reflected lower ray when it is reflected from the lower glass surface... why there's also phase change of 2nt. since both...

Hello everyone, I'm new here and new to Matlab. I hope I do place the post in the right place. First of all, thanks for viewing my post. Please bear with my English. I tried my best to explain everything clear. If you have any question about anything I wrote or spot any fault, please tell...

I'm looking to reduce the amount of books I have, but I'd like to get a few references references books to replace them. I'd like a set of books that encompasses everything from mechanics, nuclear, optics, and solid state, to ,basic lab electronics, astronomy, quantum, and their mathematical...

Hi, I will go back to school next year to start studying physics. For the moment, I am learning/reviewing maths with Khan Academy and the book of Mary Boas. Once I am good with the maths, I will start to review/learn physics (Khan Academy, Fundamental of Physics by Halliday and Resnick...

So, a while back i read about this idea, but i can't find it anymore, so i was wondering if anybody else knows about it. here it is: We know that if a vector field is conservative, then there exists some surface whos level curves are perpendicular to the vector field. or inversely, that the...

Homework Statement If you have a spherical interface between two different "media" (like air and water), and an object is placed in the one with the lower index of refraction, with the interface being convex toward the object, how can you tell if the image will be real or virtual? Here's a...

I've attached a screenshot of the question, and I have to admit I'm really struggling. I don't know if anyone will be able to help as optics is very diagram-dependent, but perhaps you can give me a hint without needing to draw anything. I'm stuck on (ii) a) The first thing I did was use...

Hello! 1. The problem statement and all variables AIM: Calculating persistence length P of a single dsDNA molecule from a data set of force F (to the molecule) vs. extension x measurements. Experimental background: pN forces were applied to a single dsDNA molecule spanned between two...

Could anyone please explain or advice me where to read about principles of Schlieren image formation NOT in terms of ray optics, but in terms of wave or Fourier optics. I understand how that works in terms of heuristic ray optics, but would like to get to know how the actual image formation...

Hello Forum, The numerical aperture NA of a lens is usually a parameter (adimensional) that indicates the lens ability to collect light. The concept of NA is usually introduced in fiber optics where we are concern with launching light into the fiber. But NA is also discussed in microscopy...

I have two lenses for my microscope. The object lens which magnifies 63 X. Then there is my eyepiece lens with f=100 mm which focuses the incoming light at an camera. How can I calculate the total magnification? All calculations so far for the eyepiece involve the 25 cm of the human eye, but now...

Homework Statement A simple method for determining the focal length of a negative lens is shown below. Prove this is true. Homework Equations The Attempt at a Solution The linear magnification formula relates magnification, the distance from the lens to the image (i), the distance from...

In thinking about what it would take to make a feasible invisibility cloak or holographic disguise or perfect hologram room, I've imagined something that works like this: A light beam "image" is projected onto a device designed to refract or reflect it in all directions, but only 1 color in any...

1. Consider a y-polarized electromagnetic wave with vacuum wavelength 600nm that is propagating in glass and then incident on a glass-air interface; use n=1.4 for glass. Take the interface surface to be the y-z plane, and the plane of incidence to be the x-z plane. Consider 2 incident angles...

I've long had a fascination with optics and have deicded to study it seriously. I want to go from high school level education to being able to understand ’ðs; xÞ ¼ Ai s  x 2
2 þ iax " # exp as  ax2 2  ix3 12 þ ia2 x 2 þ is x 2
 : or something to that effect. I want to...

I am doing "Schlieren imaging" visualization of a gas flow from the nozzle. could anyone please recommend a software to simulate a gas flow from the nozzle. in addition please recommend a software to simulate optics, like the propagation of a light beam through the optics and image...

Homework Statement may i know how to derive the the sha[pe of graph and get the point of min (2f , 4f) ? i really have no idea how to get the shape of the graph and the min point. The book give it without any explanation. Homework Equations The Attempt at a Solution

Homework Statement A sphere of radius 12.0cm has refractive index of 1.33. A speck is 4.0cm from the centre of the sphere is viewed along the diameter that passes thru the speck. Find the position of image when the speck is viewed from the nearer side? the ans is -7.2cm Homework Equations...

Could you please check the following problem? The book made an approximation. I didn't in my method. But the difference seems considerable. Did I make a mistake?

The size of image formed by a concave mirror is proportional to R^n where R is radius of curvature. Find n. Cannot understand how to proceed. Need help.

Whom might be talking on this area?

A gun of mass 'M' fires a bullet of mass 'm' with a horizontal velocity 'v'. The gun is fitted with a plane mirror facing towards the receding bullet. Find the velocity relative to its image just after the gun is fired.

[SIZE="4"]Definition/Summary Nonlinear optical processes that occur due to the presence of a second-order nonlinear susceptibility are termed 2nd order processes, or three-wave mixing processes. There are four second order processes, second harmonic generation, sum and difference frequency...

[SIZE="4"]Definition/Summary Light propagating through a vacuum will obey the principle of superposition, however this is not generally true for light propagating through gaseous or condensed media. As light propagates through transparent media, it induces a dipole moment on any atoms present...

Hello! I have a theoretical & practical question. Theorecical: I noticed that when I turn on my smart phone camera application and look 'through it' on some distant object, holding smart phone 30 cm from my eyes, then my eyes are focused on 30 cm and not in distance. Is there a way...

I was wondering what type of lens would be best for capturing the light incoming from a parabolic reflector into a container? The Fresnel lens looks like a good candidate, but I am still not quite sure. Does anyone have any insight on this subject? Just for info, the parabolic lens redirects...

What is the difference between propagation number(K) and wave number(k) described in Optics book written by hecht He defined K=2π/λ and k=1/λ and both of them have the same units (i.e, meter inverse) What does wave number of a Harmonic function tells about?

Good morning I need to ask about the exact formula for the phase shift used in stimulated Brillouin scattering especially in the phase shifter thank you

Homework Statement A lense with a focal length of ##-48.0cm## forms an image ##17.0cm## to the right of the lense. Where is the object positioned? Homework Equations $$\dfrac{1}{d_0}+\dfrac{1}{d_i}=\dfrac{1}{f}$$ The Attempt at a Solution Well, since the focal length is negative, we know...

Homework Statement Write an expression for a light wave circular polarized to the right, traveling in the positive ZZ direction, such that the electric field points in the negative XX direction at z=0, t=0.Homework Equations Right handed polarization is the same as clockwise, I think...

Homework Statement Thee linear polarizers are in sequence. Let first and last polarizer be crossed (perpendicular to each-other) and the middle polarizer rotate with angular frequency ##\omega##. Show that under such circumstances, ##I## is given by: $$I = I_0 \frac{1}{16}(1-\cos (4\omega...

This paper experimentally simulates Closed Timelike Curves (CTC) through quantum optics experiment. Since I have no experience/background in this, I found it hard to understand how exactly the CTC is implemented in the circuit. [Note: I do understand QM, so no need to explain this].

I've tried looking this up online, but people only ever talk about the basic principles and formulas involved instead of the concepts behind it. My question is this: "What is happening at a quantum level when light is refracted or reflected?" How does the light interact with the atoms of medium...

So I originally posted a thread for my optics homework listing every question from a worksheet AND my attempts. Apparently, it's seen as spam so I have tried and am now posting the second question. Homework Statement A concave mirror has a focal length of 40 cm. Determine the object...