Image Definition and 1000 Threads

On this wire grid polarizer the wires are less wide than one wavelength of the incoming radiation. Is it possible to achieve a specular reflection from a single wire as shown on the image? What about reflection in the plane of length of the wire and the plane perpendicular to it (as shown)? Or...

From https://phys.org/news/2018-01-image-hubble-cartwheel-galaxy.html The attached article explains the proposed origin of this nifty ring galaxy.

Hi colleagues, I need your help to figure out some subtle theory problmes I have about this topic. I was thinking about a system composed by a conductive sphere (not grounded) under the effect of a pont charge placed near the sphere. As I know we need two image charges to satisfy the boundary...

Homework Statement As shown in the figure, the distance between the object and hemisphere lens is R0. The hemisphere lens radius is R0. Find the distance between the image and the flat side of the lens if observing from the curved side of the lens. Refractive index of glass and air are n and...

Homework Statement I have the following variables: f = .93 m f(e) (eyepiece) = .0082 m distance toJupiter pj = 588 E^9 diameter of Jupiter dj = 139822 E^3 Find the height of the image of Jupiter created by the objective lens of a telescope. Homework Equations M = -q/p q = f Where M is the...

Homework Statement The distance between an object and its upright image is 28.0 cm. If the magnification is 0.550, what is the focal length of the lens that is being used to form the image? Homework Equations 1/f = 1/so + 1/si M= -si/so The Attempt at a Solution See included image...

Hello, suppose we are given a biconvex lens with focal length of 4 cm. Further, an arrow of height 1 cm is placed in front of the lens in a distance of 8 cm (i.e. twice the focal length). Lastly, a mirror is placed on the other side of the lens at a distance of 4 cm and such that it performs an...

Homework Statement Two convergent lens are identical in focal length (f=10cm) and the oobject height (h0) is 3.5 cm. The distance between the two lenses is 30cm and the distance from the object to the first lens is 30cm. -Draw a diagram on the figure and show the image position (di) and size...

An image specially for those in the northern hemisphere that won't see these things ... upper right - Southern Cross (on it's side) on the lower side of it, the Coal Sack Nebula. Lower centre, the two pointers, Alpha and Beta Centauri. and finally in the upper left, the huge globular cluster -...

In digital electronics -- and notably digital reconstruction filters, Shannon and Nyquist theorems -- one encounters "images" (or frequency images). In digital audio, for example, after the DAC (digital-to-analog converter), one must filter the output of the DAC with an anti-imaging filter...

Hi, I am trying to create an HUD display - basically create a virtual image at infinity and look at it. I have two plano-convex lenses; the distance between them is the sum of their focal lengths; my object is therefore imaged at infinity. Here is the schematics that I'm pretty much trying to...

Hello, I am reading a review on weak gravitational lensing (https://arxiv.org/pdf/astro-ph/0509252.pdf) and they define the center of an image as follows: $$\vec \theta_c = \frac{\int d^2 \theta I(\vec \theta) q_I [I(\vec \theta)] \vec \theta}{\int d^2 \theta I(\theta) q_I[I(\vec \theta)]}$$...

Homework Statement f=42[/B] Find the height of the image produced when a 3.0 cm -high object is placed at distance f+10cm Homework Equations The Attempt at a Solution 1/52= 1/3 +1/di di=49 However, this is wrong for some reason. Thanks

I'm looking at this link: HaarWaveletTransform. Given an array of N sample points, it subdivides the array into two arrays of size N/2: Array1: Averages adjacent sample points. Array2: Computes a finite difference between sample points. You can then apply recursively k many times. In the end...

What does object space and image space mean in optics?

What does everyone here use to upload images? Its been awhile but I've always used imgur. But now they force you to get their app. Any suggestions?

hi guys I haven't posted any images for a very long time, health/eyesight has been pretty bad and stopping me from getting out with telescope and camera. This image below of spiral galaxy, M83 ( also known as the Southern Pinwheel Galaxy) July 2016 I did a set of 8 x 30 sec images with my...

Could this be a possibility at some point? Since entanglement is not affected by distance, could we send cameras out to extremely distant places and get instantaneous signals? Only the image sensor would have to be entangled. It would still take the same amount of time as usual to get the camera...

Homework Statement Show that if T is normal, then T and T* have the same kernel and the same image. Homework Equations N/A The Attempt at a Solution At first I tried proving that Ker T ⊆ Ker T* and Ker T* ⊆ Ker, thus proving Ker T = Ker T* and doing the same thing with I am T, but could not...

I have a very basic doubt in optics . The picture below is used only to make question clearer . Suppose ocular lens was not present and position of the eye remains same , then will the person see the real image formed by the objective lens ? Thanks

Homework Statement I know that the object distance is 15 using the equation m = - (v/u) (+ or - depending on real / virtual) 2 = (+ or -) 30/u u = 15 However how do I know if the image is real or virtual? Homework Equations m = - (v/u) The Attempt at a Solution

Hi Everybody I'm a new user and hope I have posted in the correct section. I'm a beginner in MATLAB and image processing. Using matlab, I have to highlight in an object in an image. I have an input image where there is a plate with a food. I need to produce an output image where only food is...

I'm using a film projector as an editor, meaning I run the film slowly and use a low power bulb. I want to minimise any possibility of damaging the films. To view a film I simply look straight into the lens – and I see an inverted image. What I can't explain is why the projected image appears...

So,does a plane mirror(or a group of plane mirrors) ever form an inverted i.e. upside down image ? According to my own understanding, no. But in our home work this question was asked. So, is it possible??

I got an image called img and I want to sharpen the vertical spatial lines. I created this matrix: hp = [-3 -2 -1 12 -1 -2 -3]; hp= rot90(h_lowp); Then I do this to get the new image: newimg = uint8(conv2(single(hp), single(img))); It SORTA works, but I'm not so sure why it works. I mean all...

Homework Statement Suppose T:V→U is linear and V has finite dimension. Prove that I am Tt = (Ker T)0 Homework Equations dim(W)+dim(W0)=dim(V) where W is a subspace of V and V has finite dimension. The Attempt at a Solution I first proved I am Tt ⊆ (Ker T)0. Let u be an arbitrary element of...

http://imgur.com/a/nFJ0a According to this passage the image of an object after being reflected by a plane mirror is formed right next to the initial object position. However if you see the light rays, they come back exactly the same path after striking the mirror, then why doesn't the image...

Homework Statement Draw the ray diagram of the case of a diverging lens where both object and image are virtual, that is ##f<0## , ##p<0## with ##p<f## Homework EquationsThe Attempt at a Solution I did not find this particular case of ray diagram in any textbook so I would like to know where...

Homework Statement Let ##\mu : R \to R'## be a ring homomorphism and let ##N## be an ideal of ##R##. Show that ##\mu [N]## is an ideal of ##\mu[R]##. Homework EquationsThe Attempt at a Solution For something to be an ideal of a ring it must be an additive subgroup ##N## such that ##aN...

Hi, I am trying to determine the final image on a detector having a 600x600 mm viewed object and the known MTF of a lens. So when I FFT the object, thus creating frequencies -128/600 : 128/600 for a 256x256 image, how does the multiplication of the transformed object and the MTF "keep track" of...

Hi there, i want to know as much as possible about this situation. I want to know the angles of vision for a real image, where can one see the image, the location of our eye to see it. Which factors determine this angle Thank you so much :D I hope this isn't a dumb question, thanks.

NASA has consolidated its many collections of imagery into one online library, which is here.

I know it may sound ridiculous, but I've always thought of making a simple homemade image sensor. Is it possible to make a primitive image sensor using many photocells or other electronics parts? or it's IMPOSSIBLE AT ALL? I'd like to know if there are DIY methods for making an image sensor.

Homework Statement two semi infinite grounded conducting planes make a 60 degree angle. One plane along the positive x-axis. There is a charge Q at point (m,n) located closer to the plate running along the x-axis than the other. what would a diagram look like with all image charges and angles...

Homework Statement What collection of image charges solves the problem in above pictured ?? Homework EquationsThe Attempt at a Solution One of the image charge should be in dielectric region q'=-((e2-e1)/(e2+e1))

Hi PF! Attached is a binary image I have in MATLAB, where I have drawn an error pointing to some noise. Does anyone know of a systematic way to eliminate all noise below this line (or basically what appears to be the line)? I also uploaded the same image only processed, titled Noise1. This...

I have been attempting to unravel Abbe’s theory, of the role of diffraction in microscopic vision, in a ‘nuts and bolts’ sort of way, meaning in terms that I can understand: diffraction, interference and so on. While Fourier transforms are clearly at the heart of the process the assertion that...

Here's the snippet I'm erroring on. I'm sure I have a bad syntax or I'm not relative referencing correctly or something. Null pointer. xo = new ImageIcon[2][2]; xo[0][0] = new ImageIcon(getClass().getResource("img/x1.png")); xo[0][1] = new...

Homework Statement Homework EquationsThe Attempt at a Solution I don't understand what is the meaning of "potential of cylinder relative to the plane" I think the potential of cylinder is just -q/2πε ln r by Gauss's theorem[/B]

I'm trying to get my head around some ideas in Quantum Mechanics, but I'm trying to find a visual/mental image of the ideas, so that I may, in some cases, understand a little better, if that's even possible. I have a mental image of wave/particle duality and I'd like to know if it's a valid...

Saw this image of some object opening what looks like some shield to deflect or capture our Sun's energy? Not a hoax as this is captured on the HI2_SREM camera from the NAVY's SECCHI observatory. To see the image in motion click Duration: 09 days and set the HI2_SREM button and '20160823' for...

Homework Statement The first image: Without information on the interior construction of the boat or the mass distribution of the exterior shell of the boat, which of the following points can be the boat's center of gravity? The second image: Our boat from the previous question is now...

Homework Statement Let ##\phi : G \rightarrow G'## be a group homomorphism. Show that if ##| G |## is finite, then ##| \phi [G] |## = ##| I am (\phi)| ## is finite and a divisor of ##| G |## Homework EquationsThe Attempt at a Solution Assume that G is finite, with order n. Then im(G) is a...

Is the idea of negative absolute temperature analogous to a virtual image in geometrical optics? I was reading this article about such a negative temperature: http://www.livescience.com/25959-atoms-colder-than-absolute-zero.html It seems to me that since temperature is defined by its...

Homework Statement Hello I have a video that is 30 fps according to the video information (when i right click on the file). It is stated that the videos were filmed in slow motion at 1/10 of normal speed. I'm using a standard version of MATLAB to plot points (actual position) on a moving...

These seems like an easy question, but I have found nothing online: Does the size and distance of the virtual image produced by an off-axis parabolic mirror vary as a function of the off-axis angle, or will it be the same as the parent parabola? Specifically, I am trying to create a simple...

Hello, I'm having trouble with moving an object using an image. I want my image "Car" to move left and right when I press one of the JButtons. As you can see, I included a blue rectangle to kind of show you what I mean by "moving". Here is the code for the Blue Rectangle. private int carY =...

Currently I am generating an ID from an image by using K-Means to separate brightness levels into 8 levels (clusters) and order them brightest to darkest. For each cluster I calculate: 1) Their center points as a percentage of image size (using average pixel coordinates) 2) Average distance of...

There is this science gadget that consists of two parobolic mirrors, one with a hole in it and you place an item in the bottom of one, turn the other mirror with the hole on top of it, and you can see the image of the item standing above the hole in the top mirror. How is this done? Are the...

Hey! :o Let $F$ be a field and $V,W$ finite-dimensional vector spaces over $F$. Let $f:V\rightarrow W$ a $F$-linear mapping. We have to show that $f$ is injective if and only if for each linearly independent subset $S$ of $V$ the Image $f(S)$ is linearly independent in $W$. I have done the...