Image Definition and 996 Threads

I am trying to figure out how those double concave mirror set ups work to create an image above the mirror. Does anyone know what I am talking about? You have 2 [spherical] concave mirrors, both with the same radius of curvature (and thus the same focal length), one facing up, and the other...

what explains the fact that mirrors only reverse an image left to right, not up and down?

What do the mirror image problems in electrodynamics exactly focus at? Are they only based on the uniquesness theorem ,which we study in Differential equations.!But i find their application to be limited since they can be applied to a surface which is grounded.! One more thing ,how does it...

Hi. i have a photographic camerawith a resolution of 640x480.i know that at the focus point the object photographed has a length of 2 cm.i want to find the height h of the object.i was thinking that the ratio h/length would equal the ratio 480/640.am i right?thank you

I have this Physics Problem which I am not to sure where to start it from. The problem is: A real inverted image I of an object O is formed by a certain lens. The object-image speration is d = 0.40m, measured along the central axis of the lens. The image is just half the size of the...

An object is located 19.5 cm from a converging mirror with a focal length of 5.5 cm. What is the distance of the image? Is it real or virtual? Is it smaller or larger than the object? Is it upright or inverted? This is the equation I need to use for the problem 1/object-mirror distance +...

Someone's got to help me on these two. 1)Two semi-infinite grounded conducting planes meet at right angles. In the region between them, a point charge q is kept such that it is at a distance of 40cm from each of the two planes[i.e.(40,40)]. Find the position of its image charge/charges...

Why can concave mirrors produce a real or virtual image, but convex mirrors can produce only one virtual image?? As well, when an object is moved along the principal axis towards the vertex of a concave mirror, the image changes. Where exactly does this change occur and why? I know it has...

Hi; Could someone please help me with the following question: The image of a distant tree is virtual and very small when viewed in a curved mirror. The image appears to be 18.8 cm behind the mirror. What is its radius of curvature? (Use positive for concave and negative for convex). Would I...

hi, i have an OPTICS question . i am confused about the "real image" and "imaginary image". could not understand the difference. why a image will be "imaginary image" . images are images. why they have to be imaginary ?

The Following two questions are giving me the worst time. Maybe someone else can lead me in the right direction. Question 1: You unconsciously estimate the distance to an object from the angle it subtends in your field of view. This angle \theta in radians is related to the linear height of...

I am near finishing my DT project, which i chose to make a ...Rat trap. I just need advice formalising it in the sense of a front picture. I looked at google for suitable images, but couldn't find a suitable one. So i ask for your help. I know you people have quite amusing pictures...

How did I make this image? https://www.physicsforums.com/showthread.php?t=73657 I didn't use fancy tools, just basic software (although I did use Eclipse at one point but only as a text editor).

I want to write a program in Java that reads RGB information pixel-by-pixel from an image file, processes that information, and then writes it to a text file. I know how to do everything except read from the image file. I'm thinking a Bitmap file might be the best choice for the image file...

Need Help With Lens! An object is placed 10cm in front of a convex lens of focal length 20cm. Where is the image formed and what is its magnification??..Your solution should include an accurately drawn ray diagram? Pleeez help me with this question?...im so stuck?? Thanks.

A piece of glass has two radii. The left side has a radius of 2 cm and the right has a radii of 4 cm. The two are separated by 8 cm. There is a point object 1 cm left of the glass, find the position of the image. I need to use the equation n2-n1/R = n1/do + n2/di, i need to use it...

I am using the Delphi language, and I want to learn how to use the Cosine function to rotate an image. Can somebody please explain how and why the math works. I know what cosine is, I just don't know how to use it in any real situations, can somebody please tell me how to do this? Delphi =...

I was just wondering if somebody could check to make sure my logic is correct for this lab exercise. The setup is basically this: using an ophthalmoscope, a doctor can peer into the pupil of a patient to view the retina and innards of the eye. The opthalmoscope is a device with a built-in...

A narrow parallel incident beam of light falls from the left on a solid glass sphere at normal incidence. The radius of the sphere is R and its index of refraction is n = 1.52. Find the distance of the image from the right edge of teh sphere Hint was to treat the sphere like a thin lens Since...

Anyone got an image of the inside of an electron? I remember seeing something like this? It's like, there are spirals coming out of a circle? This is a photo taken immediately after two atoms were rammed into one another and therefore scientists were able to see the insides of an atom, and the...

A concave spherical mirror can be used to project an image onto a sheet of paper, allowing the magnified image of an illuminated real object to be accurately traced. If you have a concave mirror with a focal length of 8.0 cm, where would you place a sheet of paper so that the image projected...

Hi, What's the relationship between the image and kernel of T and the image and kernel of Tn? I think we saw in class something along the lines of: Ker(T) \subseteq Ker(T^2) Im(T) \supseteq Im(T^2) My intuition is that this is also correct for any natural n, but is it true and if so...

How many kinds of nature of image formed by a (45 degrees,90degrees,45degrees) prism are there...?? Can you tell me all in detail...??thx a lot.. :smile:

Can I upload the images here? so that whenever you choose my topic, they're shown, no need for you to open attachments? Any way, I am a non-native so I get difficulties solving this problem. Tell me! (it's easy but I can't use English to state some sentence) The URL of the problem: Thanks

http://img19.exs.cx/img19/9233/giraffe1lu.gif

Hey everyone, APOD just announced today that the consensus regarding the strange streak in the Australian picture that people claimed was a meteorite is likely just an insect after all. Here's a more detailed explanation- http://www.cloudbait.com/science/darwin.html

http://www.christianitytoday.com/ct/2004/012/32.56.html

It it isn't a false color image of the sun, then how are we able to look at it this way if the sun is so bright? Wouldn't it just be a picture of bright light? http://www.1spacewallpaper.com/sun-wallpaper/Sun-pictures_1024.htm Ty

i was wondering why is it that in a mirror that my image is fliped but not upside down, why is it in just one plane.

i have this projector setup with a light source having about 500 lumens as its light output.I know the distance to the fresnel lens which will be at the focal distance so that parallel light goes through the lens. I want to know how much of this light would be falling on the fresnel lens. I...

http://www.bell-labs.com/news/2000/may/11/1.html has a number of links (bottom of the page) very relevant to observational studies of the distribution of dark matter. In particular, the last three links: http://dls.het.brown.edu/, a programme to create maps of the distribution of dark...

Why is the inverse image of the open set {t|t<1/2}, {t|t>=1/2 or t<1/4}? the t>+1/2 sort of makes sense to me, but can't seem to grasp how t<1/4 is an inverse image

how i can use a bitmap as background image ? Thanks

Ok, a lens is held upright with a piece of clay. In front of it is a bulb, and behind it is a screen at the location of the image of the bulb. Now, what would happen to the image if the top half of the lens were covered by a mask? And what if the mask had a small hole in the center and were...

Is this an accurate way of displaying sine and cosine on a unit circle? :wink:

Im not talking about TVs, but radio astronomy. We receive signals from say a distant star and turn it into a picture, but how?

Anyone know how to solve the following problems? Thanks! 1.) An object is placed 12 cm to the left of a diverging lens of focal length -6cm. A converging lens of focal length 12 cm is placed a distance of d to the right of the diverging lens. Find the distance d that places the final image...

if a double concave mirror with a focal length f = -20 inches is used , where does the image seem to be located , if the image is 30 feet away from the lens first i converted the 30ft to inches and got 360inches used formula 1/p + 1/q = 1/f .0028 + 1/q = -.05 1/q = -.053 q = -18.9...

1) Aconverging lens with a focal length of 7 cm forms an image of a 4 mm tall real object that is to the left of the lens. The image 1.10 cm tall and erect. Where is the object located? Where is the image located? 2) A converging lens with a focal length of 12 cm forms a virtual image 5 mm...

i need some help with this problem anyone want to give it a shot? thanks A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.80 m stands 10.00 m in front of the camera. What is the height (including sign) of her image on...

Hello Everyone, First off, this premise I'm about to share it is very much required to hold the values of a intelligent creator aka God(s). Besides that of spirits aka souls as embodied or disembodied entities. (ghosts) Now to the premise, like the book of Genesis states we are made in the...

Would you mind if I had an image as a signature? A lot of phone line users find that annoying. But if nobody minds, I may add one on for awhile.

One of the latest images from Opportunity (mib_color1_rgbstretch-B011R1.jpg) shows tiny spheres which are interesting... but did anyone else notice the several objects which seem to exhibit bi-lateral symmetry? In the upper left quadrant of the picture, two objects appear to be identical in...

Hi, I need images of absorption and emission spectra for sodium to be used in a physics student book. Thanks in advance Stanley

http://www.post-gazette.com/pg/03266/224822.stm

Readers, please bare with me as I attempt to explain the reasoning of my question. Any help will be greatly appreciated. Suppose I turn on my radio. And suppose one of my favorite songs happens to be playing, and that song happens to include the tried and true guitar, bass and drum trio. My...