Questions tagged [reflection]

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3answers
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How are classical optics phenomena explained in QED (Snell's law)?

How is the following classical optics phenomenon explained in quantum electrodynamics? Reflection and Refraction Are they simply due to photons being absorbed and re-emitted? How do we get to Snell'...
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2answers
3k views

How can a green laser be reflected as orange?

My friend recently bought a high-powerd pocket laser pen (from China). It is green, and reflects off most surfaces as green. On some orange surfaces, it reflects orange instead. That is to say, we ...
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0answers
15 views

Reflection coefficient phase using Kramers Kronig, formula equivalence

Why are the following two formulas for the phase of the reflection coefficient equivalent (according e.g. to [1])? \begin{align} \Theta(\omega_0) & = - \frac{\omega_0}{\pi}P\int_{0}^{\infty}\frac{...
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1answer
48 views

Law of reflection of a moving mirror in special relativity (velocity perpendicular to the normal)

I have seen this question about the law of reflection in special relativity, and it is shown that, if you have a mirror moving in the opposite direction to the mirror's surface normal, the law of ...
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1answer
514 views

Geometrical optics problem [closed]

I Just wanna know the general approach to these problems, Two plane mirrors of length L are separated by distance L and a man $M_2$​ is standing at distance L from the connecting line of mirrors as ...
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1answer
26 views

Change of Young double slit pattern after a reflection

I made a Young double slit experiment on sunlight that showed clearly the pattern of maximum and minima demonstrating the wave aspect of light.Anyway, if, beyond the double slit the light is ...
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3answers
85 views

Does the accelerated mirror violate the energy conservation principle within the framework of special relativity?

I have designed a thought experiment for which I could not find a convincing resolution as of yet. Assume that a plane mirror is uniformly accelerated (Born rigid acceleration) along its normal, and a ...
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1answer
130 views

Cube Beam Splitter Ratios in Reverse

Good day to all, I the following diagram is a non-polarized beam splitter cube with a 10:90 (R:T) split ratio. The questions I have are: that when light comes back does the 90°, R path still have a ...
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2answers
101 views

Can light travel through a maze? [closed]

I want to manufacture a light proof enclosure. I need to understand: if I design a cap with a "U" section profile edge and the body with "T" or "U" section profile edge, will light be able to get ...
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1answer
56 views

Reflection of an under-water-object

I saw a photograph of a polar bear who is under the water surface. I would like to receive an explanation about the reflection of the polar bear on the water surface, which creates a second image.
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0answers
26 views

How does reflection work at a quantum level? [duplicate]

Thinking of light in corpuscular form, how does the bouncing of a photon off a reflective surface work? Is it the same photon bouncing off, or is it absorbed and re-emitted? If it's bouncing, does it ...
3
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2answers
104 views

100x magnifying optics system for short laser pulse

I am now designing an experiment that consists of a 400 nm short pulse (~300 fs). In the experiment, we need to magnify the transverse profile of the pulse by 100x. That's the problem. I was ...
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1answer
20 views

Do dieletric mirrors and other reflective surfaces have a maximum intensity to which the absoprtion coefficient increases?

That is, if you shine a laser at a dielectric mirror so that the intensity(photons/seconds*cm^2)becomes sufficiently large, the scattering of the photons off the electrons in the surface atoms becomes ...
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1answer
292 views

Mutilple beam reflection question in Fabry-Perot cavity

Just having some trouble with a question about Fabry-Perot intereferometers. Here's the first part of the question: Consider a beam of light undergoing multiple reflections in a Fabry-Perot cavity ...
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1answer
140 views

What is the relation between Reflectance and Intensity?

I am just reviewing Fresnel's equations where Reflectance $R$ is equal to $$R=|r|^2$$ where $r$ is the complex reflection coefficient. Is there an equation that relates $R$ to intensity or is there ...
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3answers
2k views

Why don't E&M fields change orientation after hitting a surface?

In essentially every derivation of the Fresnel equations, the general problem of radiation hitting a surface at a certain angle is broken into two parts (out of which we hope the solution any general ...
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1answer
40 views

What's the intuition for the reflection of a quantum particle at a potential step equal to the particle's energy?

While doing the problem of potential step, I saw that if the energy of the particle is equal to the potential energy of the step, then the wave function is a constant, or to say the probability ...
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4answers
155 views

What happens when one side of a convex lens is made fully reflecting?

Assume that I have got a bowl half-filled with mercury. In this bowl, I place a convex lens which make one side of the lens fully reflecting. What will happen to the lens, will it behave like a ...
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1answer
298 views

Why does a street light cast a wavey shimmer across the water (at night)

You will have to zoom in. Why is the reflection a wavey one? Could someone explain how this is occurring, to the layman, (with the style of feynman if possible -heh) :)
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0answers
20 views

Fermat's principle of least time for reflection and refraction [duplicate]

In discussing geometrical optics, Fermat's principle of least time is often used to solve problems and is generally used as a replacement of laws of reflection and refraction. Fermat's principle is ...
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1answer
82 views

Why can't two truly identical experiments on quantum scale give the same result?

When we refract light on air/water interface, some part of light is reflected while some of it gets refracted. My question is when we consider light as a photon and send it (photons) one by one, what ...
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1answer
38 views

Image formation of object on itself by a system of a lens and a mirror

Suppose there is a lens and a mirror. An object is placed in front of this system (nearer to the lens). If the final image of object (refraction, reflection and again refraction) is formed on the ...
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0answers
23 views

Parallel rays hitting a parabolic mirror at an angle [closed]

I was thinking about parallel rays hitting a mirror that has a parabolic horisontal cross-section and a linear (straight) vertical cross-section. I can't understand what would happen if the rays came ...
2
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1answer
39 views

Why do the LINES in a vertical soap bubble get thinner as we go down?

I understand that the soap bubble gets thicker at the bottom of the bubble due to gravity, resulting in a complicated array of different colors of different wavelengths being constructively and ...
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1answer
55 views

3D reflection of a ray on a cylindrical mirror

I am trying to calculate the reflection of a ray on a cylindrical mirror in a three-dimensional space. To achieve this, can I apply the laws of reflection separately in xy and xz planes (as in the ...
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1answer
31 views

Layer of material that transmits light in one direction and absorbs it in the other direction

I am looking for a material (or layer of materials) which transmits light coming from one side and absorbs light coming from the other side. The absorption should be as good as possible and the ...
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0answers
1k views

Difference between the increase in optical path due to refraction and that due to reflection

If we place two glass plates of refractive index $\mu$ and each having thickness $t ,$ on the way of a light ray the increase in the optical path becomes $$ \left(S_2 P - S_1 P \right) = 2 \left(...
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0answers
20 views

How to analyse dielectric discontinuity in Waveguide?

I came across this question the solution given was to use the formulae for reflection coefficient with characteristic impedance of wave guide replacing the ones in boundless medium. What I am ...
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1answer
59 views

Why does a rainbow only form with a 42° angle? [duplicate]

Why do rainbows only form with a 42° angle? Is there something special about this angle?
3
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1answer
472 views

Under water light reflection of air in a cup vs water in a cup

The last time I was on vacation I was drinking on the swimming pool, and after I was finished with the drinks I started playing with the 2 plastic cups I had, and noticed that the air produces a ...
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2answers
35 views

Far sighted mirror reflection

I am far sighted. I need reading glasses to see clearly up to a distance of approximately 14 inches. Why, when I look in a mirror is the frame around the glass blurry but my face crystal clear?
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1answer
2k views

What type of mirror is feasible for Schlieren photography setup?

I would like to build a Schlieren photography system with a single mirror setup*. My question is - what type of mirror (parabolic/spherical) is good or at least feasible for this setup? The theory ...
316
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25answers
110k views

Why are mirror images flipped horizontally but not vertically?

Why is it that when you look in the mirror left and right directions appear flipped, but not the up and down?
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1answer
263 views

Phase shift for reflection and transmission on absorptive medium with complex refractive index

I am trying to come with a hand-waving explanation as to why the reflection and transmission peaks of a metal-coated Fabry-Perot cavity are shifted in frequency (see the paper by Monzon & al). ...
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0answers
20 views

Can we study the effects of Quantum reflection on heavy atoms?

From what I've looked at, it feels like QR has only been studied on light atoms like He, Ne, Na, H, etc. But can we study this effect on heavy atoms like Rb-87. If not, is it because of the ...
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0answers
25 views

Why does a stationary mirror reflect different imagery depending on observer's angle?

I'm a scientifically uneducated buffoon with little schooling, who has just been reading about the simulation hypothesis and now can't work out something that should be straightforward. I'm lying on ...
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2answers
260 views

Confusion about the reflection coefficient when a particle going through a potential

Suppose we have a potential$$ V(x) = \begin{cases} 0, & \text{if $ x \le 0$} \\ V_0 & \text{if $ x \gt 0$ } \end{cases}$$ The reflection coefficient for the case $E \lt V_0$ is $1$, which ...
2
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1answer
32 views

Boundary condition for partial reflection

I want to solve a wave equation for the wave $\psi(x,t)$. One boundary is moving, therefore I impose the velocity $$v(x=0)=v_a\cos(\omega t)$$ the other boundary is fixed, but reflecting. If the ...
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1answer
46 views

How do I explain the below phenomenon I am seeing along the edges of my eyeglass lenses?

I am near-sighted. Here is the phenomenon: I stand in front of a light source that is situated on the ceiling so that it reflects off my eyeglass lenses and appears circular. It is a white light ...
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4answers
204 views

Is light dispersed over distance by flat mirrors?

Hello and thank you for your time: Let's assume I have a 100 squared meter circular flat mirror placed 1 AU from the sun, and let's assume my intention is to shine light on a circular area on another ...
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2answers
97 views

Snell's law and Fermat's principle

I have read this sentence on a book about the Snell's law of refraction, referring on a ray that passes from air ($n_1=1$) to glass ($n_2=1.55$): "Snell's equation can be derived from Fermat's ...
2
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2answers
322 views

Explanation of formation of Newton's rings

I was asked to do a lab report in my University about Newton's rings experiment that we made in lab. I understand that the aim of the experiment is to measure the wavelength of a light after the ...
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1answer
28 views

Reflection and Transmission at oblique incidence Griffiths

I’m working through Griffiths E&M and on page 408 he gives the boundary conditions for oblique incidence. I’ve spent an hour trying to understand how he goes from the boundary condition $$\...
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1answer
45 views

Images created by a pair of perpendicular mirrors

Let's assume we're given a pair of perpendicular mirrors. Let us set a system of coordinates as shown on the picture - the position of an object is given by $(x_p, y_p)$. Of course we would observe ...
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2answers
139 views

In diffraction When wavelength is less than slit width then does the scattered light gets absorbed & emitted from the wall or just rebound?

I know that when the slit width is less than that of wavelength then the slit will act as a point source and scatter the light in all directions. But my question is that during the scattering of ...
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0answers
175 views

Are there Optical Magnetic Mirrors (OMMs) which reflect via interaction with the magnetic field?

The most familiar mirror relies on reflection from a metal, where the very strong interaction of the electric field component of the EM wave with the conduction electrons produces a reflected wave. ...
3
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2answers
222 views

Why doesn't sound wave cancel out waves of same frequency after reflecting from the ear

We just finished our sound waves class at my university. I was taught that reflection of sound waves from an elastic boundary is accompanied by a phase change of $\pi$ while that from a rigid boundary ...
2
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1answer
56 views

Are metals more reflective at lower temperatures? [duplicate]

I understand that when metal gets hot it loses its reflective properties, but does that also mean that the colder the metal is the more it reflects?
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2answers
9k views

Would you see a rainbow from refraction when the sun is in front of you?

I know how rainbows are formed, and why. Usually it is said that the Sun must be behind the observer, in order for its light to be totally reflected inside the droplet and then reach the observer. ...
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1answer
53 views

Curved Light stream?

I was wondering, a while ago, i asked if there is a way to bend light someway, which I got the answer is index of refraction. Which is when light passes through a material it refracts to a certain ...