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# Questions tagged [method-of-images]

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### Why does concave mirror simultaneously form 2 images?

So in an experiment to find focal length of a concave mirror first we had to estimate its rough focal length. I kept an object at point which was beyond the focus in front of the mirror and got its ...
26 views

### Boundary conditions for an infinite line charge and grounded conducing plane

I'm not asking for a solution to the problem, I'm confused about what I should set the boundary conditions to, it's obvious that $V=0$ at $z=0$ because of the grounded $xy$ plane, but I don't know ...
20 views

### Force between Point Charge and a Neutral Conducting Sphere

My question is simply an extension of this SE post; I don't understand why $q'+q''=0$ (both charges of hypothetical construct) for the sphere to be neutral. I'm trying to find a parallel between the ...
22 views

### Taking into consideration the non-0 value of an equipotential in a method of images problem

If the infinite conducting plane in the diagram above is grounded, then $V=0$ on the plane and the image problem is easy to solve - just put the dotted $-q$ charge there and the $V=0$ equipotential ...
45 views

### Tricky math step in Method of Images for conducting sphere

I am trying to understand this classic method of images problem. I have four textbooks open and they are all giving me the "it can easily be shown" for a critical math step in the solution. For a ...
24 views

### Virtual and Real Images

I am well thorough with the concept of virtual and real images for a single lens/mirror. However I don’t understand how it exactly works for complex system of lens .eg-two or three lens with a ...
110 views

### Applying method of images to magnetic dipoles

I want to apply the method of images to quasi-stationary calculate the 2D magnetic field distribution of a magnetic dipole and a half space with certain electrical properties (permeability, ...
61 views

### Method of Images conundrum

My lecturer and I have found separately valid solutions to Poisson's equation in the region of interest for the following problem: Here is my interpretation of the boundary conditions: V(x,y,z \to ...
35 views

### the method of images and bringing a charge to an infinite grounded plane

The classic image problem is that of a point charge $q$ held a distance $d$ above a grounded plane. The solution is this problem is to replace grounded plane by a charge $-q$ a distance $d$ below the ...
37 views

### Why are we allowed to put an image charge inside the sphere?

In a problem with a sphere and a charge $q$ at a distance $l$ away from it, the solution involves putting the image charge inside the sphere at $a = \frac{R^2}{l}$. But doesn't that contradict the ...
100 views

### Green's function in a region between a conductor sphere and two charged spheres inside, with point charges inside of each

Please, help me. I have to find the Green's function in the following region, but I don't have any idea how to find it: I have a conducting spherical shell of radius a; in the center there are 2 ...