Image Definition and 1000 Threads

I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact that a magnifying glass creates a 'virtual image' not a 'real' one but i am having trouble working out what else is false...

Homework Statement The virtual image produced by a convex mirror is one-quarter the size of the object. b) What is the focal length of this mirror? Homework Equations 1/di = 1/f - 1/do The Attempt at a Solution i found di to be -9.3 cm but when i solved for f i keep getting it...

Homework Statement The problem is simply to find the image of the upper half-plane under the inverse sine function. Homework Equations The textbook defines the inverse sine in the following way. First, it defines arccos(w) = -i * log(w +/- sqrt(w^2 - 1)) and then it defines arcsin(w) = pi/2...

Homework Statement A point charge Q lies along the axis of symmetry between two half-infinite grounded conducting plates which form an angle theta (less than or equal to 90 degrees). a. What are the magnitudes and locations of the image charges? b. What is the total charge on the...

Homework Statement A person accidentally bit his tongue and wants to examine the bite by using a concave mirror. The mirror is placed 10 cm from the bite with the result that a virtual image of the bite appears 4 times actual size. Find the parameters s (distance from object to mirror), s'...

Homework Statement A water tank is 4 meters deep. A candle flame is kept 6 metres above the level of the water. Mu for water is 4/3. Where will the image of the candle be formed? Homework Equations The Attempt at a Solution I need a few clues to proceed. If I consider refraction...

Homework Statement I(x) is the intensity of an image after passing through a material which blurs each point according to a point spread function given by: S\left(x'-x\right)=e^{-a\left|x'-x\right|} The Fourier transform of I(x) is given by: I(k) = \frac{A}{\left( a^{2}+k^{2}...

Does anybody know what this object could be? I can post the original tiff of it, but beware that it's 5.5 MB.

When you look at a spoon, like at a mirror, the image of yourself appears to be on the other side of the mirror/spoon, where light does not go! So the image must be virtual! So tell me, since a concave mirror must produce a real inverted image when you are far from the focal point...

Hi, in questions involving lenses, when using the "thin lens formulae" if my di is negative doesn't that mean the image is on the other side of the lens? in this example however it doesn't seem this holds true.. A doctor examines a patient's skin lesion with a 15 cm focal length...

NASA may have captured an image of the aftermath of an asteroid-asteroid collision. Interesting pictures here. http://www.huffingtonpost.com/2010/02/02/asteroid-collision-sugges_n_446179.html

Hey there, They used to have the image available at the Ti website, but have since done something with it due to piracy issues. It is legal to dowload if you own the Ti89 which I do, do I am trying to locate it. A friend told me that it was on the Ti site under something else now. they have...

Homework Statement If the focal length of the concave lens is -7.50 cm, at what distance d_o from the lens should an object be placed so that its image is formed 3.70 cm from the lens? What is the magnification m produced by the concave lens described in above? Where should the object be...

how is the image recognised after electron multiplication (by secondary emission) in a Micro channel plate in the intensifier of ICCD

Let a and b be sets. Show that the following constructions are sets stating clearly which axioms you need (a) a\b. (b) A function f:a→ b. (c) The image of f. (d) Given that a and b have ranks α and β respectively, what are the maximum possible ranks of a\b, f:a→ b and the...

Recently, I asked my physics teacher how to measure the height of a virtual image behind a concave mirror. He said he wasn't exactly sure so he offered to give extra credit to anyone who could find information on how to do it. Is there anyone who can help?

I am aware that for a CCD image to be produced, various corrections have to be applied due to the limitations of CCDs in astronomy. One such correction is the fact that CCDs are not perfectly linear since each detector pixel has a maximum size - it can only collect so many electrons. So...

I want to capture image from webcam using c# and i have 2 webcam so i need an option to select which webcam i interested in. I read at the websites that we can use directshow.net or wia but my webcam doesn't support wia and directshow.net is a bit messy. Is there other more simple way to...

Hello PF users, This is my first time on these forums. I'm not sure this is exactly the right place for this question, but as I couldn't find an image processing sub forum I'm posting it here in the hopes someone can help me! Homework Statement I have a binary image (see below)...

Given 2 image taken from 2 camera in canonical position, and the baseline is b, we can find the distance Z of an object from the camera. We know that Z=bf/D where D is disparity. I read some books but still have no idea of how to find the disparity using c#. Can someone suggest some...

Hello. the main question/doubt that I have is about the possibility of image formation through parallel projection [I'll explain in detail what I mean by that]. To make myself clear, I will start with a different question and connect that to this. + Consider a small rectangular box of a...

I want to be an image tech.. This takes 28 consecutive months at N.A.I.T. Diagnostic Medical Sonography - Entrance Requirements Students must have successfully completed the following with a minimum average of 60%: * English 30-1 (English 30) * Math 30-1 (Pure) * Biology...

Homework Statement An object is 1.75 m to the left of a lens of focal length 0.62 m. A second lens of focal length -2.7 m is 0.52 m to the right of the first lens. Find the distance between the object and the final image formed by the second lens. Homework Equations (1/x1)+(1/image)=...

Homework Statement Let v1= 1 -2 and v2= -1 1 Let T:R2R2 be the linear transformation satisfying T(v1)= 9 7 and T(v2)= 0 -8 Find the image of an arbitrary vector x y...

Homework Statement Determine if the following is a group morphism. Find the kernel and the image if so. f:C_{2} \times C_{3} \rightarrow S_{3} where f(h^{r},k^{s})=(1,2)^{r} \circ (123)^{s} Homework Equations The Attempt at a Solution I'm stuck on the morphism part. So I know I...

Hello, Just started reading a beginners book on elementary differential geometry and have a small question about the term "image of a curve". It says that a parameterized curve whose image is contained in a level curve is called a parametrization of C. I am a bit confused with this...

What is image charge? and how we can use image charge? thank you so much.

Hello, I m a computer science student and i m working on a project on MATLAB and currently I am stuck in a problem.The problem is that i want to extract head from this image without using imcrop command meaning that it should automatically search and detect the head(keeping this as the...

I have to take an image with a narrow intensity histogram and widen its intensity range using a simple transfer function that scales the dominant histogram intensity range [I_min, I_max] to the range [0, 255]. They tell me to tuse a linear function that maps I_min to 0 and I_max to 255 and...

Homework Statement Here is the layout of 2 lenses: -----------------(1)------------(2)-------------I-------------- Two thin lenses, numbered 1 and 2, with the intermediate image "I" is to the right of one of the lenses. The distance between the lenses is lettered d. Both lenses have...

Hey, I have few doubts in Solid state physics specially related to Image charge & Brillouion zone. I read several books regarding this matter but still my concept is unclear. Can you kindly answer my following questions:- 1) What is meant by Image charge? When it´s formed? What is...

Hi all, I'm quite new here, but it's been a while since I've been browsing through these forums for past answered questions for calculus and physics, but now comes the time where I'm the one needing help that's not been questioned yet. Homework Statement Find some* vector funcion r with...

hello. I am wondering if there is anyway to retrieve a painted image from a galvanized sign that has rusted over. The original logo/name was likely painted in black stencil over galvanized sheet metal. I have not seen it in person yet, but from pictures it looks like image is gone and whole...

Homework Statement A small fish, four feet below the surface of Lake Lansing is viewed through a simple thin converging lens with focal length 30 feet. If the lens is 2 feet above the water surface, where is the image of the fish seen by the observer? Assume the fish lies on the optical axis...

i scanned french document and save it as image file to translate it but how can Capture Text form image and save it as txt file or word file which software will without need the scanner ?

Homework Statement You have a lens with f=1m. You decide to make a camera to take a picture of the solar eclipse. The image of the sun and its corona have an angular size of 1.00 degrees. Find the diamter (in cm) of the resulting image. Homework Equations M=theta'/theta = 25cm/f The...

Homework Statement Find an Basis for Image and Kernel of the matrix. \[ \left( \begin{array}{ccc} 2 & 1 & 3 \\ 0 & 2 & 5 \\ 1 & 1 & 1 \end{array} \right)\] Homework Equations The Attempt at a Solution To find the kernel I solve the equation Ax = 0 I put the matrix in row...

I started to receive a lot of spam recently from my computer site and a friend suggested me that is because I have my email address listed in plain text on my contact page, and that I should turn it into an image instead. How do I turn my email address into an image?

A plane mirror is placed on the level bottom of a swimming pool, which holds water to a depth of 3 m. A swimmer is located 2.0 m above the mirror. An observer above the water looks vertically downward at the swimmer and its image in the mirror. What is the apparent difference in depth between...

Like a radioactive particle emit rays, does this similar to the field lines of a charged particle? at what speed these field lines are generated from the charge particle?

Where do you put an object in front of a concave mirror of focal length 10 cm to produce an image that is inverted and 2.5 times greater than the object? I have no idea how to solve this.. help..

An object at the focal length distance from the lens is imaged at infinity,Do this mean that under this situation, our eyes could not see the image? but as our eyes could see the stars from infinity, do this mean that the image of lens which is discussed above is just viewed through screen ,and...

For f(z) = z^2 find the image of x + y = 1 f(z) = z^2 = (x + iy)^2 = x^2 + 2ixy - y^2 u(x,y) = x^2 - y^2 v(x,y) = 2xy

Homework Statement image processing I would like to rotate an m*n image matrix by any input degree, simplest cases 90, 180 and 270 on MATLAB without using any of the built in functions i.e. purely mathematical Homework Equations The Attempt at a Solution \left[...

Distance and your image on a mirror?? 1. Homework Statement A) If you are 1 meter away from a plane mirror and approach the mirrow at 1 m/s, how long does it take you to reach your image? B) At what speed do you approach your image if you walk towards a plane mirror at 1...

hello, Homework Statement A lens has a focal length of 20 cm and a magnification of 4. How far apart are the object and the image? Homework Equations m=di(image)/do(object) 1/di + 1/do = 1/fThe Attempt at a Solution Well, I don't really know what to do, I feel like I don't have enough...

I was wondering if the "Method of image charges" could be extended even partly or approximately to oscillating charges. I am not considering nearly-static problems, but really radiating problems. After all, the Poisson equation and the wave equation are rather close ! Therefore, I thought...

Homework Statement A diverging lens has a focal length of 15.7 cm. An object 1.91 cm in height is placed 380 cm in front of the lens. Locate the position of the image. Answer in units of cm. Homework Equations (1/f)= (1/p)+(1/i) The Attempt at a Solution...

Homework Statement An object is 6.0 cm in front of a converging lens with a focal length of 10 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted? Is it real or virtual? The Attempt at a Solution According to my ray tracing...there is no...

Homework Statement The near point of a naked eye is 33 cm. When an object is placed at the near point and viewed by the naked eye, it has an angular size of 0.060 rad. A magnifying glass has a focal length of 16 cm, and is held next to the eye. The enlarged image that is seen is located 51...