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Questions tagged [reflection]

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1answer
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Newton's rings. Interference by division of amplitude

We all know that in wedge shaped film fringes are equally spaced.Being a wedge shaped film Why does the fringe width decrease as order increase in Newton`s ring ?
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Proper atmospheric laser propagation including reflections

I'm attempting to model the propagation of a laser beam (specifically, its beam radius) through the atmosphere, bouncing off a (curved) surface. This is fairly simple up to the surface itself, but I'm ...
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Find the refractive index [duplicate]

A ray of light enters a transparent sphere of radius R =2.00m . This ray undergoes one reflection inside the surface of sphere and emerges out in thesame direction parrale to the first . Giving that, ...
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38 views

Optics in physics [on hold]

A ray enters a transparent sphere of radius R =2.00m . This ray undergoes one reflection inside the surface of sphere and emerges out in thesame direction parrale to the first . Giving that, the ...
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1answer
23 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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0answers
42 views

Huygens’s principle [closed]

On the application of Huygens’s principle with an incident wavefront on the mirror, we see that wavelets are emitted at each point as shown. My question is how can the direction of propagation of the ...
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1answer
23 views

How many degrees Celsius/Fahrenheit can be reached in 1 square meter area using magnifying glasses?

The magnifying glasses are each 10 meters in diameter, their collected light is concentrated via mirrors into a 1 square meter spot. Is it possible to get a temperature higher than 2000 degrees ...
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2answers
38 views

Division by 0 when calculating wave transmission and reflection coefficients

Perhaps more like a mathematical issue here... When we consider a wave propagating from medium 1 to a medium 2, boundary located at $x=0$, we have the following wave equations for the incident, ...
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Question regarding reflection in a curved mirror

Given the mirror equation, it's stated that in order to contruct the image of an object we must launch a light beam parallel to $x$ axis and that it will reflect back at the focus of the circle. This ...
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1answer
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How is reflection of light possible at all? [duplicate]

If a photon cannot be accelerated or decelerated, how is reflecting them possible at all?
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1answer
33 views

why aluminium reflect less light than matte white paint?

I'm reading the book: automating hydroponics, from Cerreto Rossouw. He wrote, p46, "you shouldn't use aluminium foil because it's quite poor at reflecting light (...) A practical alternative (...) ...
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2answers
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How is Bragg's Law related to the Phenomenon of Diffraction?

As far as I understand, bragg reflections is a geometric result which says that parallel x ray beams that are incident on atomic planes will constructively interfere at specific angles. Where does ...
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3answers
99 views

Why do we assume the reflected and transmitted waves are sinusoidal in the derivation of Fresnel's equations?

In the derivation of Fresnel equations, I often see the first step as writing down the equations of the incident, reflected and transmitted waves as sinusoidal. I understand why we do not lose ...
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2answers
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Reflection of a mirror concerning angle and wavelength

Mirror has a silver coating which helps it reflect all colors of light. From my classical understanding, silver atoms reflect light by absorbing it and then emitting it at the same angle to the normal....
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1answer
33 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
51 views

Total internal reflection of sound

Does sound experience the total internal reflection from a boundary of two materials, say, aluminum and copper? The Freshnel formulas for light depend on polarization. However, sound typically is not ...
1
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1answer
45 views

How is the image distance negative?

Following is a problem from book: "The near point of a person's eye is 53.0 cm. To see objects clearly at a distance of 24.0 cm, what should be the focal length of the appropriate corrective lens?" ...
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1answer
73 views

How can someone calculate distance between Earth and Moon using a laser?

I have a book stating: When astronauts of the Apollo missions visited the moon, they placed a mirror on its surface, facing the earth. Then scientists on the earth sent a strong laser beam, which ...
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3answers
53 views

How is energy conserved during simultaneous refraction and reflection of light?

My question is regarding the partial reflection and refraction of light when incident on a refracting surface. Here, the energy of Incident Ray is E=hv of Reflected Ray is E=hv and that of Refracted ...
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1answer
29 views

Sign convention in combination of lenses

The problem statement: Two convex lenses, each of focal length 10cm, are placed at a separation of 15cm with their principal axes coinciding. Show that a light beam coming parallel to the principal ...
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3answers
45 views

Why does the frequency of a wave does not change on reflection and on transmission? [duplicate]

I wanted to know why the frequency of a wave does not change even on reflection or transmission and does it only depends on the source only.
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1answer
41 views

Why can we see in an anechoic chamber

As in this chamber, the sound reflects off the surface and stays at that point until it dissipates. So why does it not happen with light? Is it because of the surface? If yes, then what will happen if ...
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0answers
25 views

Focusing of a cylindrical mirror in X-ray optics

Focusing cylindrical mirror are sometimes used to squeeze a photon beam in one direction. They can be vertically focusing or horizontally focusing, and such mirrors are typically used in X-Ray optics ...
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1answer
33 views

Yellow color, but not really - does it reflect pure yellow light

This question doesnt relate only to yellow, but basicly to all colors. Lets say: I have pure Yellow painting color and also Yellow painting color mixed from Red and Green. If I would turn on pure ...
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0answers
40 views

When I shine laser light on a mirror, why isn't the reflected beam noisy? [duplicate]

An interesting question popped into my head today regarding laser light. First, we know that all matter is made up of atoms, and that photons are considered to exhibit wave/particle duality. But if ...
3
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1answer
48 views

Reflection by a mirror of wavelength type dimensions

Suppose there is a perfectly reflecting mirror, which is somehow made to the size of wavelength is visible light. Will there be any reflection now, or will it act in some other way? I thought there ...
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1answer
60 views

How does color work? [duplicate]

My teacher said "Red apple is red because it absorb all light and reflect only red while our eyes can detect all light" I know that all object/thing made of atoms so different atoms are the source of ...
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2answers
87 views

How is it possible that multiple overtones can exist at the same time?

I was wondering how it is possible for overtones to co-exist at the same time. When one pulls a string, it starts to oscillate and forms a standing wave with frequency $$f_0 = f$$ Additionally, ...
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1answer
39 views

Are laws of reflection valid in all cases? [closed]

Imagine a light ray incident on a plane mirror along a vector i+j-k. The normal on incidence point is along i+j. In this case the incident ray, reflected ray and the normal do not lie in the same ...
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1answer
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Calculating light intensity with Fresnel's Equations [closed]

When light gets reflected or transmitted by another medium it's intensity splits for both the parallel and perpendicular component. Using Fresnel's equations calculating the reflected intensity which ...
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0answers
32 views

Do conductors reflect Wifi signals? If so why?

I know electric field can't pass through conductors, but I have seen people surround their wifi router by soda can (not entirely) for better signal strength. I want to know what really happens there.
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1answer
46 views

How do these toroidal reflectors form an image in two dimensions?

A torus has a major and minor radius, which means a symmetric section of one will have different focal lengths in its focal plane, or astigmatism. If it's from the "outside" of the torus (where you'd ...
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0answers
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Intuition for construction of a wave reflected from a general corner reflector

Consider a corner reflector with angle $\alpha$ between its semi-planes: Let a plane wave come from the bottom into this reflector (possible at an angle). The objective is to find the total wave ...
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2answers
92 views

If you drop a candle into an infinite well made of perfect mirrors, would you see it forever?

Part 1: If you drop a candle into an infinite well made of perfect mirrors, would you see it forever? Part 2: So when you drop a candle into an infinite well not made of perfect mirrors, the ...
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0answers
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Quantization of energy [duplicate]

A mirror reflects all electromagnetic waves that fall on it in the visible spectrum. How does the mechanism of reflection work? Is it because when a photon hits an electron, the electron jumps to a ...
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2answers
41 views

Does TIR obeys laws of reflection?

After reaching the critical angle, do Snell's laws and laws of reflection hold good?
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1answer
78 views

Reflection of magnetism

If magnetism is one aspect of the electromagnetic force, and if the propagating particle of the electromagnetic force is the photon, and if photons can be reflected by, for example, mirrors, then why ...
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Does light reflected from a plane mirror at a high angle of incidence lose coherence or intensity?

If a 100% coherent laser was directed onto a mirror at a high angle of incidence, for example 89 degrees from the plane normal, and we assume that the mirror is perfectly or near perfectly flat, does ...
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0answers
29 views

Plasma Frequency of Indium Tin Oxide

What does determine the plasma frequency? The formula is: $\omega_p² = \frac{4 \pi N e²}{m}$ and for frequencies above the plasma frequency the material is transparent. So for Indium Tin Oxide the ...
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Why does coating increase the amount of energy solar panels can generate?

As far as I know: Solar panels consist of at least two layers, that reflect and absorb light to some degree. The first layer is a semi-conductive material and the main contributor of the energy that ...
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1answer
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Reflection and transmission of EM waves

I'm reading "Introduction to Electrodynamics" by David J. Girffiths and the following assumption is confusing me: We have an EM wave inciding on a surface, Then, when applying the boundary ...
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Collimated Beam through Palladium Powder to identify the lattice structure

I came across the following Problem: A collimated beam with a wavelength of $0.162 \ [nm]$ is incident upon a powdered sample of simple cubic metal palladium. Now, five angles are given, which ...
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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
55 views

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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0answers
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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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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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0answers
19 views

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
2k views

Why does reflection occur on transparent materials? [duplicate]

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? [duplicate]

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
51 views

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 ...