Mirror Definition and 656 Threads

Hello ! What do you think of this article ? https://www.nbcnews.com/mach/science/scientists-are-searching-mirror-universe-it-could-be-sitting-right-ncna1023206 The paper dates from 2017 : https://arxiv.org/abs/1710.00767 In my opinion, it is very speculative, but a mystery is not yet...

I suppose the reason I am able to see myself in mirror and not in wood is the reflection off a mirror is specular whereas wood is diffuse. In reflective material(e.g: silver) when the photon hits the frontline atom, the atom's electrons absorbs the energy and release it back with tiny energy...

Dear forum members, We have a water cooled chiller device (see its model in attached link) and we use it to cool a hot mirror element. Unfortunately the chiller is vibrating and the vibrations couple all the way to the mirror through a pair of rubber tubes (1cm in diameter, 2m in length) and a...

Dear all, in the context of my teaching I was wondering what exactly the explanation is of how a mirror works at the atomic level. Apparently, the fact that reflecting materials are often also good conductors and hence big energy bands helps reflecting the photons. Does someone know a nice set...

Summary: How to explain the focusing properties of a 2D parabolic mirror based on third-order aberration theory? Hello everyone, I am currently studying with full-wave simulations the focusing properties of a 2D parabolic mirror, i.e. the scattered fields resulting from plane wave incidence...

What is a 1-dimensional mirror? What is a 3-dimensional mirror? How much information does a mirror contain? DE

How can a mirror reflect 99,999% of incident light? Or in other words what makes a photon exiting a laser cavity so directional? In fact, I never found a really convincing answer. Thank you.

https://www.cockcroft.ac.uk/wp-content/uploads/2015/10/gratus_RelWorksheet.pdf Refer to diagram at top page 8 showing light signal reflected (Event A) back to rocket (Event C) on t'.axis. If the space axis x' were drawn showing the position of rocket when the light signal was returned from...

A simple question but the answer is not apparent to me. I just know so little about optics. When I look at an object, I gather an impression of depth because my eyes have to adjust to the object's distance from me. I assume this is due to the angle of the light from the object - light coming...

I have been looking at various solar power dish designs. They have one thing in common, they all have their power generators located at the focal point. Why don't any of the designs use a secondary mirror located at the focal point and the generator located center of dish and right behind it...

"Our universe could be the mirror image of an antimatter universe extending backwards in time before the Big Bang. So claim physicists in Canada," https://physicsworld.com/a/our-universe-has-antimatter-partner-on-the-other-side-of-the-big-bang-say-physicists/

How to prove any orthogonal transformation can be represented by the product of many mirror transformations, please?What's the intuitive meaning of this proposition? Thank you.

I am looking for an optical piece that can act as a mirror when the angle of incidence is close to normal (90 degrees) but acts as a see-through glass when the angle of incidence is less than 60 degrees? Alternatively it can be a filter placed in front of a mirror that passes a lot of light at...

Homework Statement A mirror is moving to the right with a velocity 15 m/s, and an object is moving to the right with a speed of 5m/s. All speeds are wrt ground. Find the velocity of image wrt ground. Homework EquationsThe Attempt at a Solution I present to you two probable solutions: 1) Using...

Hi all, I need to bond the back surface of an elliptical mirror (75mm major diameter and 37.5mm minor diameter) onto a voice-coil actuated mirror mount that is going to be operating at 500 Hz and has an adjustment range of +-1.5 degrees. I need to determine the g-force likely to be acting on...

I can't see how the textbook produces the following relationships between angles: $$ \theta = \phi + \alpha \qquad (1)$$ $$ 2\theta = \alpha + \alpha ' \qquad (2)$$ My thinking is that the exterior angle theorem for triangles was used to create expression ##(1)##, but I am unsure as to how...

hi to all, i have some questions about glass silvering; i found this procedure: 1) make a solution (A) with 1.4 gr silver nitrate + 17gr water then, add to the solution 1.2gr of ammonia 26% solution 2) make a solution (B) with 9.2 gr potassium bitartrate + 4gr sodium carbonate + 17gr water 3)...

Hello, I have a question or perhaps a few questions regarding light and mirrors. When we point light at a mirror, it gets reflected back. But we can see the point light (assuming that it is a laser for the sake of simplicity) at a surface opposite to the reflective surface of the mirror. What...

Let's say I have an apparatus that's set up like this Let's also say that the mirror is infinitely long. If the mirror starts moving at subluminal speeds in the x axis, what would happen to the path of the ray of light? Would the dot made by the ray of light on the wall go up?

My students and I tried to create a Michelson inerferometer like yours (08557.00). The problem is with a mirror that moves. How did you solve this precise translatory movement? Professor of Physics Nikola Gledić - Technical school Šabac, Serbia Thanks in advantage!

Homework Statement Suppose that you want to take a mirror selfie, standing 3.05 m in front of a plane mirror. Calculate the distance that the camera will focus to, to get a clearly focused image of your beautiful self. Homework Equations d0 = diThe Attempt at a Solution Would I be correct in...

Homework Statement Derive an analytic expression for the distance from the vertex to the focus for a particular ray in terms of (i) the radius of curvature R of the concave mirror (ii) the angle of incidence θ between incident ray and radius of the mirror. Hence show that the focus moves closer...

Is there a simple way to determine or prove this? Real images are always inverted, and unlike virtual images can be projected onto a screen (I'm not even sure what this means to be honest). If I look at the back end of a spoon (convex mirror), the image is always upright and therefore virtual...

I searched for "hot mirror film" on alibaba and ebay with no luck. Only seller I found was selling such films meant for car windows. For that reason it was too thick and a bit expensive because too big. I got one but yeah, it's too thick. I figured I would find few Alibaba sellers for glasses...

We have the mirror equation (1/v) +(1/u)=(1/f) and the lens equation (1/v) - (1/u)=(1/f) Where u =object distance from the mirror/lens v =image distance from the mirror/lens f =focal length of the mirror /lens My doubt is, when we are doing some problems in optics using these...

Homework Statement Hello everyone ! I hope this is the correct place to ask. Here is my probem: I have to measure the refractive index and the thickness of the glass part of a mirror. The idea that I have, and that has been approved by my teachers, is the following: In order to measure the...

I was testing a small spherical mirror with sunlight and wondered about something. The size of the mirror is 2.5cm. The spot size of the reflected light grows over larger distances but it doesn't seem linear. For example, at a meter or less, the spot is very close to the mirror size but at a few...

I've only seen a handful so far, but I really liked the haunted house video game episode from the first season.

The point B(3, -1) is reflected by the line g and results in B'(5, 7). The equation of line g is ... A. 4y + x - 15 = 0 B. 4y + x - 9 = 0 C. 4y + x + 15 = 0 D. 4y - x - 15 = 0 E. 4y - x - 9 = 0 Since I didn't know how to approach the problem in a formal, textbook way, I tried to get...

(sorry if posting in the wrong place) I am looking for some mirror setup where rotation one or more elements in the mirror setup will allow to shift the beam along its axis. Two mirrors in a galvanometer scanner type setup work well for controlling the angle of the beam. Rotating risley...

From time to time we have some minor threads mentioning real vs complex representations of fermions, chiral theories, etc and how a loophole is to use mirror generations, but I do not remember some detailed discussion of how does it work. For starters, do we need an even number of...

I have a Cassini PM-160 spherical mirror used in telescopes as the primary mirror. The mirror is concave with a radius of curvature of 2600mm and focal length of 1300mm. I have a very basic question. If an on object is located beyond the focal length of a concave mirror then the virtual 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...

What is exactly happening when the light hit a surface of a mirror? I know it is not same as a bounce of ball from the wall, because of constant speed of light for example. So I suppose the light is absorbed by electron of reflecting material. This probably define the materials who are...

Homework Statement I have noticed that in cars in India on rearview mirror(convex) it is written that "objects in mirror are closer than they appear". But for convex mirror of focal length 1 metre and object distance 39 metre, the image distance is 39/40 metre . Which tells that image is closer...

Homework Statement Gaussian beam of radius R_i and beam width w_i, The beam is reflected off a mirror with a radius of curvature R = R_i and the reflectivity of this mirror is given as rho(r) = rho_0*exp(-r^2/a^2), where r is the radial distance from the center of the mirror and a is a...

Homework Statement I am working on this problem. They start out by giving me: I am asked to find Rref such that Vcc=8V and Icopy=0.38mA. Homework Equations Transistor equations The Attempt at a Solution In this case, they never specify if IB=0A (sometimes it does ?) but I would assume that...

I was reading a pdf that mentioned a quantum-controlled beam splitter and wondered whether a quantum-controlled mirror exists. In the beam-splitter case, the beam splitter could either be present or absent, such that path information of photons was either preserved or not. It was controlled...

Homework Statement Where on the axis of a concave mirror would you place an object to get a half-size image? Express the object distance in terms of the focal length f. Follow the sign convention. Homework Equations (1/q)+(1/p)=(1/f) f=(2/R) The Attempt at a Solution I attempted to use the...

I have a thought experiment that i need a answer to. In my experiment, I am in a bathroom with a mirror along one wall. I also have a laser that emits a single file line of photons. The laser is attached to the ceiling and emits a line of photons parallel to the mirror. What property of light...

NASA just announced a solar probe to travel quite close to the Sun, about 3.7 million miles from the solar surface: Nasa’s hotly anticipated solar mission renamed to honour astrophysicist Eugene Parker. Renamed the Parker Solar Probe to honour solar astrophysicist who predicted high speed solar...

Homework Statement Derive the mirror equation for a convex mirror (Si*So=f^2). Do not use a Ray heading toward the center of curvature point (C). Si - distance between the object's image and the focal point. So- distance between the object and the focal point. Do- distance between the mirror...

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??

The tangent passes through just one point Now i can draw it such that the angle of incidence is always 0 and incident angle is always 90 Then no image will be formed. Why does this not happen??

If the normal is always 90 to the mirror can we assume that it always passes through centre of curvature? The light rays passing through the centre are reflected back in the same direction as angle of incidence is 0 and incident angle is 90 so, the normal should pass through the centre.

Which metal platings on glass will provide 100% reflection as a mirror? In which case we will get an brighter image than the actual one in mirror?And in which case it will be darker?Which metal(used for platings) will absorb a very little amount of ray? Can anyone give the explanation?

Hi. In a Mach-Zehnder interferometer, there are mirrors in both paths. When a photon gets reflected on a mirror, it transfers momentum. Also, mirrors are classical objects that are usually not assumed to exist in superposition states. Shouldn't it (at least in principle) be possible to measure...

What is the Sun ray brightness quality after mirror reflection and what affects it? How to get the efficiency after reflection?

Homework Statement The object in the figure below is midway between the lens and the mirror, which are separated by a distance d = 24.9 cm. The magnitude of the mirror's radius of curvature is 20.4 cm, and the lens has a focal length of -16.5 cm. (a) Considering only the light that leaves the...

Homework Statement A convex spherical mirror with a focal length of magnitude 24.0 cm is placed 22.0 cm to the left of a plane mirror. An object 0.300 cm tall is placed midway between the surface of the plane mirror and the vertex of the spherical mirror. The spherical mirror forms multiple...