Optical Definition and 701 Threads

Hi there, I am very new to optical domain, and I am only used to the common bandpass filter that we use on circuits, those RLC and OP-AMP based bandpass filter. I went through few books and can't really find the difference, do anyone have any link regarding this issue or idea about this...

Hi everybody, I’m a new user of Zemax, I did some tutorial so I begin to know the functionalities of the soft. But my major trouble comes from the fact that I don’t know really the procedure, the drill.. to make a system from particularities data. For example, I try to do the exercises of the...

What considerations would a lens maker need to take into account when designing a lens? So on top of the chromatic aberrations, glass type and focal length, I have: Lens Thickness Magnification Resolving Power Radius of Curvature Shape(ie cylindrical, spherical, plane) Type(ie convex...

What is optical depth? I have searched everywhere but I can't find any satisfying answer. It's stated often with radiative transfer that its the integral of the absorption coefficient for a certain distance. You usually distinguish between optical thin (tau <= 1) meaning you can 'see' through...

Hello everyone. I have an understanding problem with the Optical theorem definition. From Wikipedia : "In physics, the optical theorem is a general law of wave scattering theory, which relates the forward scattering amplitude to the total cross section of the scatterer. It is usually...

Could you teach me about spin orientation by optical technique. Thanks a lot!

Although optical fibres do not break easily, is it possible to bend the optical fibre too much that light that travels within the optical fibre will strike the wall at less than the critical angle and thus escape from the fibre through the wall? Pls enlighten me. Thanks! (I came across this...

First let me preface this by saying by physics-fu is remedial at best. I am a neuroscientist by training, but need a little help with piece of equipment I am designing, so any ideas or input would be greatly appreciated. Basically, I need to figure out a way to efficiently couple a light...

A friend has just given me a beautiful 1960-ish optical pyrometer. It is a Pyro Optical Pyrometer, made by The Pyrometer Instrument Co. with serial number 14081. Cannot find model or type. Now. To the questions. Does anyone know how this thing works? The physics I understand slightly, as...

Will anyone give me an explanation helping me understanding it?

Hi I just started a PhD where I am going to use lasers to measure fluid flow among other things. I am looking for some helpful information about otpical components and techniques mainly relating to lasers. How to correctly design a setup, how to split beams, how to expand/contract beam...

Homework Statement I have written a working program that can obtain a numerical solution to the nonlinear Schrodinger equation, given at initial pulse, using the split-step Fourier method. I have performed the first task of writing a working programme and have shown that if the initial...

Homework Statement Hi. I'm required to calculate the magnification of a microscope with the variables given. I have calculated this, but was just wondering if the best viewing distance is bigger than the length of the microscope, would this have any effect? Homework Equations N/A The Attempt...

It looks like a leopard, and it is a painting, but there's more to it... Anyone see it? :biggrin: Hint:

An object is placed two focal lengths from a diverging lens, (a) What kind of image forms? (b) What is the magnification? (c) Where is the image? I am pretty sure the image is virtual, as for (b) and (c) I have no idea what to do.. Looking for some help, thanks in advance.. (a) I am...

Homework Statement first question; Does a double slit also diffract light of different wavelength into different directions? second question; How would a diffraction grating for cm waves differ from an optical grating? Homework Equations sin (theta) = m.Lambda / d maybe, i am unsure...

Hi, I am reading about a new field that I am not familiar with at all, and I was hoping that someone could give me some info on that. The general idea is that if you have a conductive layer, with a periodic array of apertures perforated in it (such as crosses), you can design a band-pass...

Homework Statement A blue semicon LED is connected in series with a 10ohm series resistor to a voltage source. The LED emits 4.03 x 10^16 photons/s at a wavelength of 400nm. The current flowing through the LED is 40mA and the voltage across the LED is 3.5V. Calculate the power conversion...

What? Is there any truth to this? The caption on a space.com photo of the oldest object ever found says, "… since all the optical light has been absorbed by intergalactic hydrogen gas, leaving only infrared light." I'm thinking the expansion of space is a more likely explanation...

Hi, I'm in the first year of my engineering course and I've only completed the first four months of the course. As you can imagine,I don't have a very good grasp over my subjects yet,but I'm trying really hard! In our physics syllabus,we have a few things about communication through coaxial...

Hey all, I went to my 10 year HS reunion party last night, and took about 125 photos using my Sony Alpha 350DSLR, a kit lens, and a Promaster hot-shoe flash. The camera was set to manual exposure of 1/10th sec to allow the ambient light to fill in the background, while the flash was left on...

Imagine a double star with components separated by 10 astronomical units (10 AU). How far away can such a system be while remaining resolved with a 300 mm telescope? Show workings and give your final answer in either light years or parsecs. (Ignore atmospheric effects). Thanks.

Homework Statement The following elements should have optical spectra similar to either a hydrogen atom or a helium atom. Indicate which of the following elements should have optical spectra similar to a helium atom. (Select all that apply.) The choices are: Cadmium, Lithium, Technetium...

We have very frequent questions regarding the "microscopic" details of the process of reflection, the cause of transparency, etc. in solids. In many cases, people often still think of this as being caused by "atomic transition", neglecting the fact that these are solid state physics and not...

Does anybody know how to find bonding force of an optical electron and the nucleus of ion Cr3+ (in pink ruby during normal and excited states (excitement of light))? And also how to find the magnetic moment of the same electron during EPR (during excitement by a radiowave)? Condition of the...

Homework Statement Which of the following oxide materials when added to fused sillica (SiO2) will increase its index of refraction: K2O, Na2O, CaO, BaO? Why? Ionic radii of the ions: K+: 0.138 nm Na+: 0.102 nm Ca2+: 0.100 nm Ba2+: 0.136 nm Si4+: 0.040 nm O2-: 0.196 nm Homework...

Hello, I don't know if anyone is familiar with OCT, but my question is rather specific and a well explained answer is in my opinion nowhere to be found ... In OCT, a low coherent light source is used in a simple Michelson interferometer setup. One beam (reference beam) is sent onto a...

For example , optical carrier in the infra red region can provide higher capacity than microwave.

I was endeavouring to build the (almost, at least) Theremin on this page: http://www.popsci.com/diy/article/2008-04/build-pocket-theremin-cheap However, I was wondering what kind of resistance the photocells should have. I suppose I could work up a better abstract understanding of the...

So I was watching the Sun set the other night, and I noticed that the Sun appeared to accelerate into the horizon. If the Earth rotates at a constant angular speed, how could this be? I was thinking about swinging a ball on a string vertically, and how the ball would have different points of...

So, let's say that you wanted to find the optical transition rate between subbands for electrons in a quantum well. To a good approximation, you can say that the wavefunctions are of the form \Psi = \psi(\vec r) u_c(\vec r) where u_c is the Bloch function and the lowercase psi is a...

Does anyone know by any chance or maybe know where to look for a guide instructing you how to make a pen tablet like this out of an optical mouse?

Homework Statement In the 7 diagrams below, the solid arrow represents the object and the dashed arrow the image. The rectangle shows the position of an SINGLE OPTICAL ELEMENT. Match each diagram with the appropriate optical element. 1)http://img190.imageshack.us/img190/5176/92585723.gif...

I am shining a HeNe beam into a 1:1 solution of 40% HF and 7% potassium permanganate. Potassium permenganate is very dark purple (cannot see visible light throught it). I am shining the HeNe through about 2 millimeters depth of this solution. I was wondering how much of the beam is actually...

Today, I was red-necking it up with some friends in Auburn at the nearby forest. We found an open area on a decent sized creek that was filled with mostly less-than-fist-sized river rock. After dark, we noticed that when a rock was thrown to the ground (on the other rocks), a small spirt of...

Homework Statement Problem: Show that unitarity (of the S-Matrix which has implications to the amplitud of scattering of 2-2 bodies scattering of unstable particles) fixes the numerator of the Partial wave amplitude near the \Delta-pole, q M_1 =...

I'm confused. I read a line in a book where there was a qualitative explanation about the optical theorem, namely that it is connected with conservation of particle number. But I think that this is only true if we just consider elastic scattering. Inelastic processes would of course allow a...

Homework Statement part1: In the Figure below a lens of focal length 8 cm is placed between a plane mirror and a pin hole. The other side of the pin hole is illuminated by a light source (not shown), so that the light passes through the hole and is then collected by the lens. If the pin hole...

Fusion raction produces high energy neutrons which cause activation of the walls of the reactor. Why can't their energy be collected by, for example, a microwave beam?

Dear all, I need a suggestion for my work. I have to measure the variation of some optical features of a material in presence and absence of a magnetic field. Hence, I need to “switch on” the magnetic field in a given instant time, to record the signal an then ““switch off”, or even to change...

i have two optical lens assemblies performing separate functions individually. Now I want to allign their optical axis .. how do i achieve the alignment? (actually i want to allign them back to back and ensure that their optical axes are concordant, if not overlaping ,then atleast parallel )

Homework Statement In an experiment it is found that the optical density of a solution of compound X was 0.7 when measured at 400nm. in a 1cm glass cuvette. The solution had been prepared by dissolving 35mg of X in 50 ml of water. What is the molar extinction coefficient of X at 400nm...

Hi, time ago I found some Youtube videos and a website about this kind of device made of mirrors that invert the light coming from an object, and the effect (even if I don't remember precisely) should be to disrupt the sense of depth. This is a quickly made illustration of this device...

Hello everyone, I have an exam in a few days and need help with a question on one of the past exam papers. An optical position encoder used on a robot axis has a 10:1 gear ratio, an optical disc with 72 slits, and a 12 bit binary counter. Determine: (i) The resolution of the encoder i.e...

When designing a space based energy satellite for our project, we ran across the option to just use a mirror to reflect extra light to a photovoltaic ground station on earth. The main difficulty of this option is that due to the fact that the light coming from the south pole of the sun hits the...

Show how the band model can explain the relationship between the optical and electronic properties of solids? any ideas one were to start looking? lost with this question

Homework Statement The normalized extinction is defined as F(\lambda) = \frac{A_{\lambda}-A_v}{A_B - A_v} where A_{\lambda} is the extinction (in magnitudes) at wavelength \lambda . B and V are wavelength bands but for the purposes of this question we will assume that they represent...

Homework Statement A jewelry maker has asked your glass studio to produce a sheet of dichroic glass that will appear red (wavelength=692 nm) for transmitted light and blue (wavelength=519 nm) for reflected light. If you use a MgF2 coating (n=1.39), how thick should the coating be...

1. A diverging lens with a focal length of -14 cm is placed 12 cm to the right of a converging lens with a focal length of 18 cm. An object is placed 33cm to the left of the converging lens. Where will the final image be located. 2. 1/f = 1/di + 1/do dob = L - dia 3. After solve...

Homework Statement Light falls at normal incidence onto a transparent film on a substrate as shown i. what is the optical path length difference in the case of normal incidence? ii. if nf>no and nf>ns, what is the condition for constructive interference in the case of normal incidence...