Optical Definition and 701 Threads

edit: the TeX is still being screwy, not putting the equations in the right places. stay tuned. editII: fixed, I think. Homework Statement I'm working on converting a BRDF to a PSD, S(fx,fy). Homework Equations In the book 'optical scatter: measurement and analysis', the BRDF is given as...

Homework Statement A 3.1 cm--tall object is 26 cm to the left of a lens with a focal length of 13 cm. A second lens with a focal length of 8.0 cm is 42 cm to the right of the first lens. Homework Equations 1/s + 1/s' =1/f M=-s'/s and I'll have to multiply the two M's together to get the...

Let's say you have two pulses from the same source, one whose phase is slightly delayed relative to the other one. Now, I know that you can use an interferometer and a balanced detection-type scheme to measure the phase shift (in which case you can be shot-noise limited), but I'm wondering if...

hey guys! we know that velocity of a wave = wavelength x frequency. and speed of light changes with change in optical density. so there must be change in either frequency or wavelength or both. which of these quantities change with change in optical density? and why?

Homework Statement Homework Equations \frac{\delta{F}}{\delta{y}} - \frac{d}{dx}\frac{\delta{F}}{\delta{y'}} = 0The Attempt at a Solution I'm having trouble setting this one up. If I let the functional be F(x,x',y) = n(y)\sqrt{1+(x')^2} Applying the LE equation I obtain...

I know this very cool free software to create interactive geometry projects: http://www.geogebra.org/cms/ Does it exist any similar program which simulate how light rays move among mirrors and lens? If not, how can I simulate a lens in Geogebra? (a mirror is easy).

Which of the following materials have activity Optical ? i know it must have an Chiral molecule,but still i am not know in this list who have it. thanks for help.

Homework Statement is this compound chiral??why or why not?? http://img827.imageshack.us/i/gmp.png/ Homework Equations The Attempt at a Solution i don't think it is...what do u think??

Homework Statement A sample of synthetic camphor contains both the d and l isomers in unequal amounts . The specific rotation of the sample is found to be -13.9 degrees . What is the enantiomeric excess of the sample? (A) 0.215 (B) 0.314 (C) 0.417 (D) 0.167 pleasez xplain ur...

Hello all I have been working on a Raman OTDR setup over the past few months as part of my project work. I have been using an optical BPF which takes backscatter from the fiber under test as input and gives the stokes' and anti-stokes' spectrum as outputs. My guide asked me to calculate the...

I am a senior in high school and currently deciding on what I want to do with the rest of my life as many others are. I have always enjoyed optics. I enjoy reading up on optical physics and up and coming optical technology (and of course playing with lasers). My question is would I enjoy optical...

I constructing 3D shape of about 2 millimeters sized. Which kind of optical coating will give me 10 degrees of half view angle for reflected light in visual spectrum ? thanks Alex

When we drive a car on a hot day we have all experienced what appears to be water on the road. I believe that this is related to the facts that 1) the air near the hot pavement is less dense than the air a few feet above and 2) light will travel from point A to B along the fastest path (in this...

Homework Statement The sugar concentration in a solution (e.g., in a urine specimen) can be measured conveniently by using the optical activity of sugar and other asymmetric molecules. In general, an optically active molecule, like sugar, will rotate the plane of polarization through an angle...

Hi all, I have a question regarding a fiber optics based communications system: The light source is a Fabry-Perot LASER, which outputs 5 longitudinal modes. The communication rates are: \Delta\omega=100Grads^{-1}, B=10Gbs^{-1}, and the dispersion coefficient is \beta_{2}=10\frac{ps^{2}}{Km}...

How to specify a lens to increase angular responsivity of optical sensor? Sensor I presently use has angular responsivity +/-60 degrees at 50% level and I would like to increase it to +/- 80 degrees at 50% level or more. Which lens should I use? Please advice on design guidance for this...

Hi. This is my first message in this forum. I'm not English, so sorry my spelling. Homework Statement Calculate the optical path done by a meridional ray, supposing it covers a horizontal distance, d, in z-axis direction. \gamma_0 is the launch angle (with z-axis).Homework Equations Optical...

Does anyone know where I can find free information on Spontaneous Emission? I can't seem to find even a basic lecture on the Rabi frequency. Please help me out! Thanks

Homework Statement In a Young's double slit-type experiment using light of 600 nm with 0.5 mm between fringes, a thin plate of glass (d = 100 micrometers, n =1.5) is placed over one of the slits. What is the lateral fringe displacement on the screen? 2. The attempt at a solution To be...

Hi, I am a physics undergrad designing a solar spectrometer as part of a senior design type course. If we have light incident from the sun onto some sort of telescope objective (say a single lens for simplicity, focal length "f" and aperture radius "R") and then a pinhole at the focal point...

Question: An optical fibre is 1.0 metre long and has a diameter of 20micro-meter. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end? A) 18000 B)...

I have a question concerning optical tweezers. How do you make sure that the focal plane of the beam and the laser are the same..? In other words, I can see the laser on my CCD image when it is reflected off the cover slide, but if I see the reflection of the laser then the beads that are...

I'm a senior in high school who is still trying to figure out what I'm going to do with the next few years of my life. Early on, I was planning on going for the all to frequently debated PhD in physics until I realized I would like to keep my sanity not to mention get a job. I just recently...

Hello. I'm trying to develop a clear image of Raman and Brillouin scattering in my head, but one uncertainty I have is what are the physical differences between the generation, propagation, and any other characteristics between Optical and Acoustic Phonons in silica fibre (such as, what is it...

Hey all I am using optical fibers as a read-out medium form a PCB. I see interference in the data through this fiber. Can someone shed a light on the interference patterns on the optical fiber? Usually one should not see any electronic noise in fibers. How true is it and how to get around it...

These are some fun illusions. http://videogames.yahoo.com/events/brain-teasers/brain-teasers-and-optical-illusions/1400154

A couple of days ago I burnished a very rusty old piece of steel with a fine steel wool. It's now very smooth, and there is no loose rust scale. It has a finish somewhat like a century-old doorknob in some old building at a university. Some place where hands have rubbed it many thousands of...

Homework Statement A child decides to use a THICK (not thin) lens as a magnifying glass to look at a bug such that her eye is focusing on an image that is located at her near point, which you can assume to be 25 cm from the childs eye). The thick lens consists of radii of curvature R_1 = 5.0...

Is there an experiment that uses photons or other particles to measure the effect of Earth's rotation on them? Thanks

I've searched the net and haven't found an explanation for the term, so hopefully this will now return on searches for people. Besides, I'm confused about the term myself. What is meant by "optical conductivity"? How is it different from say a DC conductivity in J = cE where c is...

Homework Statement You see an optical illusion of an ever-upward spiral staircase. The climber trudges up and up and never gets anywhere, going in circles instead. Suppose the staircase is provided with a narrow ramp, allowing the tired stair-climber to push a wheelbarrow up the stairs. The...

Are there any applications of optical devices in environmental science? What technologies, companies and research groups are involved?

I studied optical tweezer, So I saw the optical path in the diagram. Then I can't understand why they use the Wollaston Prism? After launch the laser, the beam through the half-wave plate So the beam polarized, I know this. and after through the half-wave plate, the beam through...

How can we derive or prove the principle of optical reversibility from more basic principles?

Can someone give an intuitive explanation for this effect? I didn't go through the derivation carefully, but I know that the upshot of the math is that the dipole feels a force in the direction of the intensity gradient, so it goes to the focus of the laser. But I feel like there must be some...

I. Overview Another SA asked me to elaborate on a remark I made to the effect that frequency shift phenomena always (even in Minkowski vacuum) involve at least the following ingredients: two (proper time parameterized) timelike curves C, C' an event A on C ("emission event") an...

Dispersion Relation: w2=B(1/m+1/M)+-SQRT[(1/m+1/M)2-(4sin2ka/mM)] For waves on a diatomic row of masses, what is the physical meaning of acoustic and optical branches of this dispersion relation? What is the expression for the maximum frequency of the optical branch? Really stuck on...

Hello all, what is meant by soft optical modes. Is it just the Einstein modes with low frequency ? thanks.

Hi, I have been assigned to a new task in my job where I have to investigate on measuring the distance to an object by means of optical interferometry (Michelson interferometry). I have been looking for info on the subject but have not been really lucky. I have been able to obtain the...

Anybody else had this? It's a recognised medical phenomenon that's quite bizarre, slightly unsettling and could lead the gullible into all sorts of hysterical beliefs. In my lifetime so far it's happened just twice. And that's a long, long time. You get a little spot of scintillation...

can someone trained in ellipsometer can guide me how can i obtain optical constants of a thin film which is sandwiched between two films of known optical constants. with such multilayer samples interference oscillations become difficult to resolve but i am sure that top layer is non-absorbing...

Homework Statement Sorry if this is the wrong section. Please redirect me if there is a more appropriate one. I'm looking at the timing spread in the time of flight of photons through fibers in a fiber optic faceplate. Essentially the minimum time for photons to propagate through one of the...

One more question ,is there how can i decide for my fibre cable type, how can i check the bandwith . normally how can i know the sensors (proximity,capacitive,etc.) bitspersecond of sensors and limit switches,so that it will fit the desired optical cable bandwith. i am in a confusion whther...

Greetings. I am attempting to model the path of light through different vessels containing water. For example, water in a test tube (pyrex), or water in a quartz cuvette. I am looking for a program which can handle the properties of the container (glass composition) and the medium (water). I...

i have a serious question for reducing the cables and cost of a machine i want to use optical fibre(OF) ,if we have approx.50 sensors,limit switches ,potenstiometers and vavles solenoids all together in one part of a machine can i convert the output of these to get a signal form or multiplexing...

Homework Statement A single glass lens has a refractive index of 1.5 and radii of curvature R1 = 5cm and R2 = -5cm. Write down the analytical and numerical system matrices for the lens (note that the analytical system matrix should be written down in terms of the relevant refractive indices)...

Hello, I have a question which has something to do with band structures etc: A two dimensional solid has two electrons per unit cell. The crystal potential is weak and the solid behaves like a free electron metal. Estimate the threshold for interband optical transitions in terms of the...

Homework Statement An optical system consists of two identical lenses; the focal length of each lens is fo (where fo) is positive). The lenses are separted by a distance d. Denote the focal lenths of the lens assembly by f and f'. a) Show that for any separation of the lenses f = f'...

Hi, Is there a particular type of optical filter which is suited for use with diverging light? Most of the filters which I have encountered; dichroic, interference ... are suited to collimated light. I have an application where I would like to long pass filter a diverging beam of light...

Hi there, I've just read the following: The expression that is given is: \int_{A \infty} e_j \times h_k* \cdot \widehat{z} dA = 0 where * denotes the complex conjugate, and z^ is the unit vector in the direction of propagation (along the axis of the fibre). Can anyone explain...