Images Definition and 366 Threads

[SOLVED] Forming Images with a Plane Mirror Homework Statement (a) How rapidly does the distance between you and your mirror image decrease if you walk directly toward a mirror with a speed of 4.7 m/s? (b) Repeat part (a) for the case in which you walk toward a mirror but at an angle of...

Homework Statement I need help with this general question. Why is it impossible to focus a virtual image on a screen, ( object is placed between F and lens). Homework Equations this experiment we had a candle on one side, a converging lens in the middle, and at the other end a screen...

Hi guys, I was just wondering if any of you knew if there have been any programs that have been written by people to perform character recognition in an image file. That is, you have an image of written text and you want to somehow recognise and extract characters. So for example, if you had...

Hey folks, I plan to use a figure from a paper (Hubble diagram for type 1a supernova demonstrating accelerated expansion).' I'm want to put the image in a \LaTeX document. Of course, I could use the Snapshot tool in Adobe reader and then grab the image and import into photoshop say then...

In Fortran I need to output some data as a bitmap image, to visualise results. Problem is, with every WRITE statement it seems to append some unwanted bytes before and after the data itself. I have found out that these are called record delimiters, but I want to turn these off. How?

Hello. I would like to share some images taken by the Mars Express spacecraft . Please click on the links below. Thanks. http://www.marsesa.9f.com/slide_show.html Source Image: http://esamultimedia.esa.int/images/marsexpress/306-230906-3253-6-co2-Cydonia_H.jpg

[SOLVED] basic proof about inverse images of sets Homework Statement let f map X onto Y, and let A be a subset of X, B subset of Y 1) Prove that if y is in B, then f^(-1) (y) is in f^(-1) (B)The Attempt at a Solution 1) I think I'm missing some two-line proof, because I'm getting nowhere...

Homework Statement If I e.g. want to find the kernel and range of the linear opertor on P_3: L(p(x)) = x*p'(x), then we can write this as L(p'(x)) = x*(2ax+b). What, and why, is the kernel and range of this operator? The Attempt at a Solution The kernel must be the x's where L(p'(x))...

Homework Statement Two parallel mirrors that face each other are placed along and perpendicular to the x-axis at x = +11.00 m and x = -11.00 m. Assume that a point source of light is placed on the axis at x = +2.70 m. In principle, there will be an infinite number of images generated...

Homework Statement Two parallel mirrors that face each other are placed along and perpendicular to the x-axis at x = +11.00 m and x = -11.00 m. Assume that a point source of light is placed on the axis at x = +2.70 m. In principle, there will be an infinite number of images generated...

Homework Statement f(z) = (z+1)/(z-1) What are the images of the x and y axes under f? At what angle do the images intersect? Homework Equations z = x + iy The Attempt at a Solution This is actually a 4 part question and this is the part I don't understand at all really. The...

http://news.yahoo.com/s/ap/20071028/ap_on_fe_st/odd_bigfoot_in_pa

Hi, So, I'm confused about the difference between real and virtual images. Let's use a concave mirror for example. I understand that a real image is formed when the actual light rays reflect off the surface and converge to one point. A virtual image is formed when the rays don't themselves...

I don't know if this is the forum to write this, but I would just like to give firstly some encouragement to the moderators of Physics Forums : you are doing a great job! This is a remarkable resource. I have subscribed to several of the RSS feeds for the forums, which I find very handy...

I'm reading about the method of image charges at http://en.wikipedia.org/wiki/Method_of_image_charges The page describes a charge located above a single conducting surface. What happens if the charge is between two conducting surfaces? Does the bottom plate, along with the imaginary...

Homework Statement Prove that if T is a linear transform, and vectors v1,..., vn are linearly dependent, then Tv1,...,Tvn are linearly dependent Homework Equations The Attempt at a Solution I tried this: Assume A1v1 + ... + Anvn = 0, where all Ai are scalars. Taking the...

The method of images exploits the fact any linear combination of solutions to a differential equation is also a solution, and the fields and potentials from a point source satisfy all relevant diff eq's, assuming the boundary conditions are met. However, a scalar multiple of any solution is...

Consider a matrix A, and let B = rref(A). Is ker(A) necesarily equal to ker(B), and is im(A) necessarily equal to im(B)? I want to say that the answer to both questions are yes because A and B are the same matrix, i.e. there are a finite number of elementary operations that can change A to...

How does the method of images work? I can see why it works (by going back to the form of the Green function and differentiating) but don't see how useful it is to solve problems. At the moment I am basically memorising the different images for each boundary condition which I am sure is not the...

A virtual image is formed by a convex mirror that has a 30cm focal length. Where must the object be placed if the image is to be half the size of the object? I know that since the mirror is convex F is negative (F is the focal length). Useful equations are 1/Do + 1/Di = 1/F, where Do is...

I need some help guys with this one. Say you have two mirrors like in the image below, with some angle phi between them. The question is how many images would be formed if the angle between them changed to 20, 30, 40, 60, 90, or 0 degress. Is there some sort of equation that will give you this...

Dear all, I have some difficulties in understanding to use the method of images to solve Poisson's/Laplace's equation with boundary values. I understand that the Uniqueness theorem(s) enables this method. In this method we use image charges and setup a different configuration without...

Homework Statement Consider a matrix A, and let B = rref(A) (a) Is ker(A) necessarily equal to ker(B)? Explain. (b) Is im(A) necessarily equal to im(B)? Explain. Homework Equations The Attempt at a Solution I feel confident saying yes for (a) and no for (b), and what I can...

When I want to see how \LaTeX image displays by the preview option,the image can't be generated (no matter if I reload page or not). Why?

Homework Statement To conducting planes are placed at an angle 60 degrees to each other. A point charge q is placed on the line bisecting this angle at a distance a/2 fro each plane. Find the image charges and the resulting potnetial Homework Equations V(0,0) = 0 V(x,0) = 0...

I've got a sequence of illustrated images that I want to run as an animation. What is an easy shareware way to do this? (It is a simple cell animation sequence that I once did.) I've got a gif animator program but my images are large and plentiful (say, 320x240 x 100 frames).

Homework Statement An infinite conducting sheet has a hemispherical bubble of radius a. (Refer to the diagram) 2. The attempt at a solution ok i know the boundary conditions should be (Phi refresents the potential) And we are working in CGS units... units with which i am not entire...

Hey, I was wondering what's the best way to generate mathematical images? I was really hoping of creating a few really high resolution ones and popping down to the print shop to have them printed out. But I have a couple of problems: 1) How do I go about generating a mathematical image...

Electromagnetics - Method of Images ? Hello all, I am in the process of preparing for a entrance examination. In the course of studying I came across this problem that I just can not figure out. Here it is: A perfectly conducting plane is located in free space at x=4, and a uniform inifinte...

Sir/Madam, 1)The 2 adjacent walls and the ceiling of a rectangular room are mirror surfaced.What is the number of images of himself does an observer sees? If it was the case of 2 mirrors I know it is 3. But here there are 3 mirrors which are mutually perpendicular. But if we take 2 mirrors at...

Hi I was wondering if somebody could kindly tell me what the difference between a real and a virtual image is. The way I which I know them apart is that in a real image the light rays actually intersect, while a virtual image the light rays diverge , thus never actually intersect. Is this...

I've seen images of space many times in the media. Do the images that we see acurately depict the universe? Or are the images so distorted by gravity that the true structure of the universe and various objects in it are not readily revealed?

Describe the image under exp of the line with equation y = x. To do this you should find an equation (at least parametrically) for the image (you can start with the parametric form x = t; y = t), plot it reasonably carefully, and explain what happens in the limits as t approaches infinity and t...

I've got an image, GIF, JPEG or other ( I can easily convert between most formats) and I want to insert it into a Latex document. Could someone please give me instructions on how to use this. I'm using TeXnicCenter on a Windows system.

Does anyone know what could have caused these kinds of doppler-radar images: http://img452.imageshack.us/img452/909/ind23br.gif More radar images of the same event: http://www.softspotopening.com/

Is there any way to make LaTeX images appear with more contrast when saved (in my case, as png, but jpeg and bmp are equally bland) and/or printed? Thank you.

I have two stars that are separated by an angle of 3x10^5 radians. They are both emitting monochromatic light on 600nm. I would like to find the diameter of the smallest telescope that can resolve the two stars. For the angular limit of resolution I have \Delta \theta = \frac{1.22...

hey, i tried the following problem and i think i got it wrong well. here is the problem and what i did. problem A photograph of a zebra is taken from a distance of 100m with a 50mm lens. A second picture is taken from a distance of 50m with the same lens. What is the ratio of the height of...

Here are some images from the Very Large Telescope project. Some pictures are over 70MB! http://www.eso.org/outreach/gallery/vlt/images/Top20/Top20/topvlt.html

Okay, so I have to do a Lab Report, easy enough, I've done them before, but it isn't so clear, and when I tried doing it, I wasn't sure if I was even doing it right. (Personal Note: DO NOT TAKE PHYSICS CORRESPONDANCE! ><) Anyway, here's what I have to do. The Lab Report is on the...

I just start learning Image and Kernel of Linear Tranfsormation, I find it very confuseing that what is the relationship between span, image and kernel in Transformation T= Ax; x=vector. Therefore I don't know how to describe the image and kernels of the transformation in : Q1 : Reflection in...

I am looking for ways to illustrate the chemical makeup of minerals. I belong to a mineral club and I am scheduled to give a presentation to the children about the polymorph mineral group of Kyanite, Andalusite, and Sillimanite. I would like to have images of the atoms that make up these...

Do you see coloured images if you listen to music? Does a certain music chord taste salty for you? Are numbers coloured for you? http://en.wikipedia.org/wiki/Synesthesia Then you might be a synaesthete. I'd like to ask if anyone here has such a synaestetic ability.

The situation is illustrated in the attachment. I try to find the force on q by the method of images. I know that the potential is 0 at x=R and at infinity, and I know that The potential obeys a certain Poisson equation between those points. I will try to put a charge q' somewhere at x<R that...

http://maps.google.com/ Don't know how many of you have already used it: still in beta phase, but you can zoom in on any adress and convert it into a satallite image :biggrin: (pretty cool)

Hi, I'm working through the "Building an Application: Part 2: Introduction to Inheritance, Panels, and Layouts" on java.sun.com and the code I've written compiles fine, but the images that are supposed to appear in the JPanel aren't there. jl = new JLabel("Java Technology Dive Log", new...

OK here I am, bigshot, giving out advice on how to rotate an image when I'm just trying to learn that myself. I'm trying to do this in Matlab; it's rotating, but for some reason the rotated image is acquiring a black background and has various lines and dots superimposed on it. Can anyone...

Hi everyone--I've been mulling over a homework question from earlier in the term: Suppose you are standinig in the middle of two mirrors of length L separated by a distance D. ((i.e. if you are standing at the origin, the centers of the two mirrors are at x=\pm \L/2)) The mirrors are at a...

When a lens diverges light it is a virtual images, when it converges light it is a real image. My teacher said that virtual images cannot be displayed on a screen. We did an experiment and that was the case. But how come we can see with our eyes the virtual image? Thanks in advance!

Does anyone know of any Windows XP software that can burn Macintosh .toast images to CD? - Warren