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Questions tagged [reflection]

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Relative reflection symmetry [on hold]

Please explain what is relative reflection symmetry in physics and how this apply to conservation law and conserved quantity. From this demonstration posted with title Time Coordinate Transformation ...
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Electric field produced by a moving charged particle above a planar dielectric interface

The electrostatic field of a single charged particle above a planar dielectric interface is a standard example given in many books (see example 4.4 in Griffiths or https://en.wikipedia.org/wiki/...
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2answers
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Is snow falling too fast or too reflective to produce rainbow?

Imagine millions of water molecules suspending in the air starts to turn into snow, I like to know the exact reason why we cannot have snow bow, is it due to the speed of each snow falling very fast ...
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Why doesn't Feynman take the real part of a complex EM wave before finding the intensity?

This is from The Feynman Lectures vol 2 chapter ch 33 on reflection of complex EM waves on metal. In the above I would expect $\frac{I_r}{I_i} = \frac{Re(E'_0)^2}{Re(E_0)^2}$, rather then $\frac{...
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Number of images with multiple mirrors [on hold]

A person is in a room house where the ceiling and two adjacent walls are mirror. How many images are formed?
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Knowing the position of the image in concave mirror if the object after C [on hold]

I've been trying to know the formation of an image in a concave mirror if the object after C (or 2f) mathematically. I know that the focal length equation: $1/f=1/(do)+1/(di)$, since we want di we can ...
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3answers
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Are rainbows three dimensional? If so, what determines their depth? [duplicate]

I am wondering whether rainbows are three dimensional, and if so, what determine their depth? How to calculate the depth of a rainbow, given its radius? From what I understand, all rainbows are ...
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Phase difference of waves [duplicate]

Why do light and sound waves under change in phase on reflection and is the change in phase for displacement and pressure wave the same in case of sound waves??
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4answers
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Why does reflection occur on transparent materials?

Why does reflection occur on transparent materials? For example, air/glass or air/water (two different interfaces) Mostly it's refraction that's occurring, but I also see some reflection. Why is that?...
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Why is frosted glass reflective at an angle?

I have a Pixel 3, and the back of the phone is frosted glass. I noticed today that if I look at the back from a wide angle it becomes reflective, whereas it is opaque when looking directly on. What ...
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1answer
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Does polarized light reflect in the same polarization?

If vertically polarized light hits a linear polarizer aligned at a 45 degree angle from the polarization of the light, my understanding is 50% of the light will pass through and have its polarization ...
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1answer
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How does reflective Heads Up Display (HUD) film work?

I've been seeing this reflective HUD film more and more. It seems to let you look through it, but reflects the brighter parts of a display. The end result is similar to a video game where you get a ...
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2answers
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Why do mirrors not follow brewster's angle?

Normally a material will have an angle where the reflected light is completely polarized. Now say we have a mirror (implemented by a conductive silver coating) that reflects most of it's incident ...
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1answer
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Reflection in a lake

Suppose there is lake. And a cloud is at a height h above it. The reflection of the cloud will be at the same depth in the lake as the height of the cloud or at the surface of the lake or at the base ...
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1answer
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number of photons per area: after reflection != twice the distance

Say we have a light source emitting $N$ photons per unit area. In the first case, the photons are reflected at a distance $r$ from the source and measured again at the source. Divergence caused the ...
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2answers
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Reflectivity with Complex Refractive Index

I would like to ask a followup question on a previous post found here. Starting from the general expression for reflectivity: $$R = \bigl\lvert\frac{n_1-n_2}{n_1+n_2}\bigr\rvert^2$$ and substituting ...
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0answers
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Difference between Scattering and Reflection

I am confused: What exactly is the difference between optical scattering and optical reflection? To me, both terms are distinguished by where we place the observation plane. Reflection: Observation ...
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1answer
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Feynman Lecture 33: Fresnel coefficients derivation

The Fresnel coefficients are: $ a=\frac{2\sin\,(r)\cos\,(i)}{\sin\,(i+r)},\quad b=-\frac{\sin\,(i-r)}{\sin\,(i+r)},\quad A=\frac{2\sin\,(r)\cos\,(i)}{\sin\,(i+r)\cos\,(i-r)},\quad B=-\frac{\tan\,(i-r)...
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Why is angle of incidence equal to angle of reflection?

In the Law of Reflection, the angle of incidence is equal to angle of reflection. Why is this true? This is clearly true experimentally, but how does one prove this true mathematically?
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1answer
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Feynman Lecture 33: Are Fresnel coefficients real?

In the Section 33-6 Feynman says: It is possible to go on with arguments of this nature and deduce that $b$ is real. To prove this, one must consider a case where light is coming from both ...
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1answer
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Does a reflection grating not follow the law of reflection?

The Law of Reflection states that the angle of reflection is equal to the angle of incidence. However, consider the case of a reflection grating with light incident at only one specific direction, ...
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3answers
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What is the purpose of glass in mirror as it only reflect very little light?

In a typical mirror there is a thick layer of glass followed by a thin layer of silver coated on one side of the mirror which reflects most of the light, what purpose do the glass have?
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Universe under Point Reflection — or why is the Neutrino not its own anti-particle?

The spin of a anti-neutrino points into the same direction as its momentum. The spin is a cross-product, so under point reflection it remains the same, whereas the momentum gains a factor of $(-1)$. ...
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2answers
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Estimate surface ability to reflect light with a consumer grade camera?

Question: Is it possible to measure the albedo of a surface using a standard camera (DSLR or from a mobile device)? It is highly probable that 'albedo' is not the correct term because, to me (feel ...
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1answer
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Looking for something to reflect ultraviolet light at extremely low wavelengths [closed]

I am looking for some sort of mirror that will reflect ultraviolet light at extremely small wavelengths (200-250 nm). The main purpose of it is to amplify the ultraviolet light and cause it to spread. ...
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1answer
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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. In this question I wish to know if this mention when applied with a dense ...
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6answers
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Would A Perfectly White Room Always Be Lit Up?

I was thinking about this the other day, and I still can't find an answer. Theoretically, let's say there's a room and all the walls are painted perfectly white, meaning it will reflect 100% of all ...
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2answers
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Does a string vibrating with hard boundaries contain harmonics of the fundamental frequency?

When the string of a violin is plucked, the resulting sound contains harmonics of the fundamental frequency. Is this an inherent property of a string with hard boundaries vibrating? Does an ideal ...
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0answers
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Amplitude of a wave: will it be an overlap of two waves or is there another reason?

For a wave with initial conditions and with a velocity = 1.00 m / s the following graph was obtained: The spatial domain is [0; 50] m and the time domain is [0, 50] s. The wave reaches the boundary ...
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2answers
77 views

How does mirror reflect light (according to quantum mechanics)? [duplicate]

We all know that light is reflected from mirror but my question is that what happens at Quantum level when the process of reflection is happening? does the photon first get absorbed and then re-...
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2answers
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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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2answers
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Is reflection of EM-waves just a “re-transmission”?

An electromagnetic wave impinging on the surface of metal will cause the free charges on the surface to accelerate which leads to radiation. Is this the basic idea of reflection? As certain surfaces ...
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2answers
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Where does laser reflection (1) come from?

I have the above experiment setup where a triangulation-based laser scanner projects a laser (line) towards a transparent glass material. I then took a picture using my phone (indicated in the above ...
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1answer
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Why we see water like effects (reflection) at some distance from the driving seat on a motorway in sunny weather? [duplicate]

When we are driving on motorway in sunny afternoon we can observe a mirror like reflection on the road at some distance why is it so. !!?
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2answers
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What is the model for wave reflection?

in this animation from the Fresnel equation wiki we can see a wave bouncing back in the "negative" compared to the "positive" incoming wave. What physics model govern such behavior in transverse waves?...
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2answers
48 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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3answers
93 views

Why do we see virtually inverted image on concave side of spoon?

As we know that a virtual image is always erect then why do we see a virtual inverted image in the concave side of a spoon.
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0answers
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Analytical Solution: EM Scattering from Hemispherical Indentation in Plane

I have a problem of trying to calculate the losses that occur when a beam of light reflects from the surface of a partially transparent medium that has an open cavity. The circumference of the cavity ...
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working to understand virtual images

I'm starting to understand how to use lenses a bit more, but I'm still pretty lost. I'm building a project that's extremely similar to this one with the implementation. I think my biggest challenge ...
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1answer
22 views

Air gap in a radiant barrier insulation system: why?

It's generally accepted that a reflective surface, when used to insulate a system by reflecting radiant energy back to it, must have an air gap in front of it. Why exactly is this, and what determines ...
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9answers
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Why can't we see images reflected on a piece of paper?

Why can't you see a reflected image on a piece of paper? Say you put a pen in front of the paper, even when light rays are coming from other sources, hitting the pen, reflecting back, and hitting the ...
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1answer
58 views

Light reflection from a charged surface

Will we see differences (in intensity or spectrum) of visible light reflection from surface of positively versus negatively charged metal plate (or any non-conducting materials)? Are there data about ...
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2answers
61 views

Impedance Matching in a String

I was reading 121st page of HJ Pain's Vibrations and waves and I saw this with the derivation of impedance matching on a string :- The conditions derived were: The impedance of coupling string be ...
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1answer
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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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1answer
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Difference between current and voltage waves with the transverse electromagnetic waves on a transmission line

In a transmission line consisting of 2 parallel wires, one can show that the voltage and current exist as a wave propagating along the wire. When calculating, for example, the reflection coefficient ...
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1answer
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Will the frustrated total internal reflection occur if the third medium is a metal?

What would happen if i set up a frustrated total internal reflection experiment with a metal as the material close to the interface? Would radiation energy be transmitted to it and undergo attenuation ...
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1answer
60 views

Acquire gradient data of a surface from deflection measurement

. In the figure above, a laser beam with source at point $I$ falls on a surface (DUT) at point $P$ and gets reflected. The reflected ray falls on the center of camera at point $R$. From the figure it ...
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4answers
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What are the differences between Convex Lens and Convex Mirrors?

Sometimes I heard my teacher said convex 'lens' but other time I heard he said convex 'mirror'. The main problem I am currently facing right now is using the right terminology. In other words, what is ...
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1answer
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Thought experiment on plane mirrors

I was just doing this thought experiment: Consider a well illuminated cubical room with all its inner six faces as mirrors. Now we place an insect inside the cube and it starts moving on the floor of ...
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1answer
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How does the reflection coefficient change with scattering and absorption?

My professor of Biomedical Optics course asked us to think upon the evolution of the reflection coefficient with the absorption coefficient $\mu_a$, the reduced scattering coefficient $\mu_s'$ and the ...