Mirror Definition and 656 Threads

Can we see a real image with our naked eye without using a screen to capture image? Also, we all know that virtual image formation in a concave mirror will be always erect. Check out the image below. Spoon here acts as a concave mirror and the image is inverted. Why is it virtual then?

not to hijack - but seems not worth a separate thread. Is it possible to clean a telescope mirror? About 30 years ago i bought Dad a 6" Meade mirror out of Sky&Telescope magazine. We built a simple Newtonian with a redwood twelve sided tube. Local astronomy club deemed it "handsome" which...

Homework Statement "An object 10 cm tall is placed at the zero mark of a meter stick. A spherical mirror located at some point on the meter stick creates an image of the object that is upright, 4 cm tall, and located at the 42 cm mark of the meter stick. Where is the mirror located and what...

Hi, During my internship I worked with an Ellipsometer. Now I'm wondering, what values of Psi and Delta do you get when you measure a mirror under an Ellipsometer? Are there any phaseshifts at all? Because there are no layers on the mirror right? It's fully reflective in total.. Hanna

I read somewhere that the focus of a plane mirror is at infinity because rays after reflection from a plane mirror don't intersect anywhere. But why can't the focus be virtual as in case of concave mirror ?

This isn't exactly a homework problem, per se, but this was a district assessment I already took today. I was confident that I would get a good grade, but it turns out I got a measly 65%. I don't remember the exact wording, but I do remember the general idea of it.Homework Statement There are...

Homework Statement A convex mirror with a focal length of -20 cm is 18 cm from a convex lens whose focal length is 6.0 cm. An object is located between them, 10 cm from the mirror and 8.0 cm from the lens. The object will produce two images, one from the light which just goes through the...

So we are learning the lens formula and I have two textbooks, my school textbook and another one that is much more detailed. My school textbook gives the lens formula as:- 1/f=1/v-1/u while the other one gives 1/f=1/v+1/u (v is image distance and u is object distance) There both different! I...

This is the last problem of my weekly physics homework and I'm having trouble A large mirror is hung from a nail. The supporting steel wire has a diameter of 0.20 mm and an unstretched length of 1.70 m. The distance between the points of support at the top of the mirror's frame is 1.40 m. The...

The question and my attempt have been provided in the attachments...my problem is trying to find the differential gain, i have worked through to an answer but the answer I'm getting doesn't seem correct...also i have absolutely no idea how to derive the common-mode gain...any help is much...

Homework Statement When viewed from Earth, the Moon subtends an angle of 0.5° in the sky. How large an image of the Moon will be formed by the 3.6 m diameter mirror of the Canada-France-Hawaii Telescope, which has a focal length of 8.5 m? Homework Equations 1/s + 1/s' = 1/f, but I'm...

1. Homework Statement : In a loud single mirror exp. a bright fringe of width 0.2 mm is seen at a point on the screen kept at a distance 1.0 m from the source. When the mirror is raised up to increase the angle of incidence at any point of the mirror by a dist. of 0.9 mm, fringe width of the...

So I noticed something that started in high school... people would use the washroom, wash their hands, and just look at their selves in the mirror for a good amount such as 30 seconds. And then later in high school, I noticed that some people would just go to the bathroom to look at themselves...

Suppose a driver his reversing his car with a speed of 2m/s, the driver sees in his rear-view mirror (which is a plane mirror) the image of a truck parked behind his car. What will be the speed at which the image of the truck appears the driver? According to me, since the distance between the...

Homework Statement A 5cm mirror is just large enough to show the whole image of a tree when held 20 cm from the eye of the observer whose distance to the tree is 100 m. What is the height of tree? Homework Equations n/a The Attempt at a Solution n/a

A ray of light is coming along the line $y=b$,($b>0$), from the positive direction of the x-axis and strikes a concave mirror whose intersection with the $x-y$ plane is the parabola $y^2 = 4ax$,($a>0$). Find the equation of the reflected ray and show that it passes through the focus of the parabola.

Hi, I was wondering if anyone could help with this problem that I am stuck on? Homework Statement I need to work out a formula for the irradiance(intensity) as a function of the distance for a LLoyd's mirror interference arrangement. The question suggests considering the similarities...

Homework Statement Optical System: Biconcave lens and convex mirror separated by distance 'L'. Object placed 0.40m in front of the lens. Final image is .12m from the vertex of the mirror Lens curvature radii: 0.10m and 0.20m Mirror curvature radii: .12m Calculate the distance 'L'Homework...

Homework Statement An object is placed in front of a convex mirror whose radius of curvature is R. What is the greatest distance behind the mirror that an image can be formed? A. Infinity B. R C. R/2 D. No image can be formed. Homework Equations 1/do + 1/di = 1/f The...

Homework Statement A mirror is moving uniformly in a direction normal to its plane with velocity v=βc. Given the angle of incidence and frequency of an incident photon (θ_e,nu_e in the figure), calculate the reflection angle and the observed new frequency (θ_i,nu_i in the figure). Also...

Hi All, The question is rather simple: Why a plane mirror image exchanges right with left but does not interfere with up and down? Best wishes, DaTario

This is an even numbered exercise so I am not able to get confirmation from the book on the correct answer. Homework Statement An observer in a rocket moves toward a mirror at speed v = .8c relative to the reference frame S. The mirror is stationary with respect to S. A light pulse emitted...

As an amateur astronomer I want my primary mirror (diameter 37 cm) to maintain the same temperature as the air. Small fans on the backside do the job. Only, the air cools quicker during the night than the 1.5 cm thick glass. Do I obtain a slightly lower temperature on the backside by sticking...

When an object is moved away from a plane mirror, its size decrease when seen in the mirror. But, when we draw image on paper for an object in different positions in a plane mirror, the size of the image doesn't seem to change. Why? Will the size change or not?

Hello all. So I'm currently studying about current mirrors (specifically the Wilson current mirror). I'm reading "The Art of Electronics," page 89 (fig. 2.48 or the image attached). In there it says: Ok so most of this makes sense to me, but shouldn't Q3 be the one "circumvented" from the...

If I shine a laser at a mirror, it would be reflected back. If I got a super powered laser, could I still reflect it back? Would it start burning through the mirror? I'm thinking it's a case of imperfect reflection. If there were such a thing as a perfect reflector, you could reflect any...

I was practicing homework and I came across these two derived equations from 1/f=1/d0+1/di 1st one 1/di=1/d0-1/f 2nd one di=d0(f)/d0-f How do distinguish which one to use? and how did they get that derivation for the 2nd equation?

Preface: I understand that regardless of any further details, the correct answer is "No, it does not, because..." I'm looking for an answer because clearly I don't understand something about either thermodynamics, mirrors, or black body radiation. In my mind, the scenario I describe follows the...

Homework Statement A plane mirror made of a very thin piece of glass lies flat on the ground. As shown in the following figure, one end of the mirror is 2.1 m from you and the other end is 35 m from a nearby tree. You are 1.6 m tall, and the mirror has a length L. The mirror is arranged so...

I'm not sure if this is the correct area to post this question, but I don't know where else it could go. If it is incorrect, can someone please move it to the correct area if that is possible. This is a purely hypothetical question, and I am by no means good at physics (just starting out)...

Optics-Lenses -- image outside the mirror? A question in my book asks what are the images formed in this diagram: http://www.flickr.com/photos/80147355@N05/7362964734/sizes/m/in/photostream/ I thought there was only one, inside the mirror. But it turns out that there is another one...

This paper is getting splashed all over the science news heres the arxiv version: http://arxiv.org/pdf/1203.1035.pdf heres the Physics world version: http://phys.org/news/2012-06-neutrons-parallel-world.html They seem to be claiming 5 sigma , any thoughts? Less prosaic explantions?

Matter (deBroglie) waves is a concept and it's existence is not confirmed (?)..that said, We know that - The de Broglie equations relate the wavelength λ to the momentum p, and frequency f to the total energy E (including its rest energy) of a particle how closely do the properties of matter...

(without using the intuitive yet eronneous idea of "spin" meaning "spinning")

An object which is 0.54m tall is located 1.23m in front of a plane mirror. How tall is the image as seen in the mirror? I know that the image seems to be 1.23m from the surface of the mirror and that the object seems to be 2.460m from the image. What equation do I need to use to figure...

I have a real-world situation I need help with before I run out and spend money. I have a wall that is in the shadows. I want to use a convex mirror to reflect sunlight onto the wall, covering as much of the surface area as possible. I will need a convex mirror with the right diameter and...

Why is the parabola the most bent, concave, effective mirror? What are some properties of a third order mirror (absolute value of x^3)? There is no uniform focal point. Shouldn't shining a light beam along a normal to the x-axis reflect off of the function multiple times? Then take this to the...

Homework Statement Suppose the radius of curvature of a concave mirror is 5.0 cm a) Find the object distance that gives an upright image with a magnification of +1.51. Homework Equations 1/Do + 1/Di= 1/f m=-di/do=hi/ho The Attempt at a Solution First i convered all cm...

Homework Statement You placed a 10cm high object in front of a mirror and got 5cm high virtual image at (-30cm). (Hint: watch the sign convention) a. Find the magnification b. Find the object distance from the mirror c. Find the radius of curvature of the mirror then I have to know if...

Homework Statement Prove the complex amplitude reflectance of a spherical mirror is given as exp[-jk(x2+y2)/R] Homework Equations Transmittance of a spherical mirror is also exp[jk(x2+y2)/2f] The Attempt at a Solution I have totally no idea how to go about doing this. Can I just...

Homework Statement A small object is located 32.0cm in front of a concave mirror with a radius of curvature of 40.9cm. Where will the image be formed? Homework Equations tan(θ)=-h/di f=1/2R? The Attempt at a Solution Haven't been able to solve for theta. I'm not sure what...

I'm starting out with QM (I have a maths degree) and have come up with the following problem to help me understand QM more. Say we have a mirror lying flat on the ground. We shine a laser from the East on the mirror at say X degrees, to be reflected to the West at X degrees. At the quantum...

Homework Statement An object 2.00cm high is placed 12.0cm in front of a convex mirror with radius of curvature of 8.00cm. Homework Equations Where is the image formed? Draw a ray diagram The Attempt at a Solution do i use the equation m=-q/p? if so then (object distance)p= 12cm...

Consider a Michelson interferometer with semi-transparent mirror with a reflection coefficient for the intensity, R and transmission of T=1-R. The mirror does not absorb anything. Calculate the intensities of the light in the two outputs as a function of delta_x = x_2-x_1 which is the...

If a surface is perceived as being white because it reflects all wavelenghts of visible electromagnetic radiation, how does this differ from a mirror surface which also reflects all impinging light? How is a mirror different from a white surface i) optically and ii) at the level of condensed...

I have re-written this as as I accidently deleted my original post. I was wondering if the relativistic Doppler shift of a reflection from a mirror moving away from the observer was the same as the Newtonian equation in the special case that the mirror is orthogonal to the direction of motion...

Hi I have build a setup where there are two RC motors to drive a mirror which is 2 dimensional. I have been thinking to write a program in Arduino such that after tracking (from solar tracker which i already made) the sunlight , the mirror should always be reflecting on a desired angle no...

Optics -- Reflection of image from a moving mirror I have a dufficult question which I couldn't find an answer to, yet: If I am standing in front of a mirror - I can see my image, naturally. Now, let's say that the mirror is actually a very long train and it moves parallel to me . And...

Hi, I am an an artist hoping that you scientists can kindly help me with some advice. I am making a simple liquid mirror as part of a project about reflected image. It will spin and stop and spin and stop etc. I have made a polyester resin parabola as a receptical (so that I can use less...

Hi, I just bought an iPad mirror screen protector and I'm really puzzled about how it works. You can see a video of the protector here The mirror quality is very good, of the order of 95% reflectivity, and it's not a metalized film as transmission is ~95% You can see in the video that...