Light reflection — 38 discussions

The difference between the principle of looking at the color of an object and the principle of the line spectrum Are both related to emission lines following electron transition?

https://glassphotonics.com/all-products/grey-field-polariscopes/gfp2600-product-line/ In this link you can see a photoelasticity instrument that is all-in-one, and compact. Traditional photoelasticity (left hand side, (a), in this picture) is not compact and has an awkward apparatus setup where...

Hello, Is there a mirror that will reflect light in parallel trajectories ? If yes, is the reflected light in sync, and will all beams hit a flat surface simultaneously ? Thank you

I'm studying particle counters and one of the detection methods uses reflected light to determine the sizes of the particles. What principle does it base on? Thanks!

Even if a beam of light strikes a reflective surface at an angle 'A', the change in momentum should be 2mc, P=2IcosA/C but I find it P= 2Icos^2(A)/C.

Homework Statement Between two pieces of glass (##n_1=1.70##), there is a thin film of water (##n_2=1.33## and width ##d=1 \mu m##). If there is normal-incidence of white light on the water surface, find: (a) which wavelenghts can be seen in the light transmitted (answer: 667 nm,533 nm,444 nm...

I have seen many articles lately regarding planned manned missions to the moon and Mars but the question of radiation protection constantly comes up. Engineers keep proposing various shelter designs that use local materials (regolith) as a concrete base to absorb harmful radiation so that the...

Light is Reflected from the surface of the object or pass through it(interior) and then the light is reflected ? Sorry for my "noob" question i am a 3D designer just looking for some more knowledge Thanks in advance

The complex amplitude ratios for light are defined as: rTM = ErTM / EiTM tTM = EtTM / EtTM I've done the derivation from Wikipedia and see that (n2/n1) * tTM = rTM + 1. But I don't understand what is going on physically. I understand that these values are not power or intensity so I can't...

I'm a bit new to studying physics so I hope this question doesn't sound off. I already know this "Photons are emitted from an atom when an electron transitions from one state to a lower-energy state. The energy of the emitted photon equal to the difference in energy between the two states."...

Sunlight hits our planet, for example, and reflects light outward back into space. Hence why photos can be taken of Earth from outer-space. But if we disregard technological limits to optics, etc., then in theory how much information does this reflected light contain? Is it rich enough, for...

Light beam hits the mirror perpendicularly and returns to the source (left picture). The same system in horizontal motion (right picture) is skewed due to length contraction so that both beam and mirror are at higher angle. Because the beam returns to source in the system's rest frame, it must...

If there was a room with all walls that are 100% reflective and a light source. If you were to instantaneously remove that light source, would the room still be lighted? If yes, if an object and the light source were previously present the room, and were to be instantaneously removed, would the...

Electric field of an electromagnetic wave incident on a metal accelerates free electrons, and these accelerating electrons then emit radiation opposite to the electric field of the wave, thus reducing the resultant amplitude in the forward direction. Radiation emitted in the backward direction...

I know emissivity parameter of Stefan-Boltzmann equation is related to both "absorption" and "emission" of the material. But is it related to "reflection" property of an object? If not what is the parameter that makes an object shiny?

From this video of a Feynman lecture: At 39:30 he (Feynman) draws a line from the eye to the mirror, and then continues the line through the mirror, to represent where the image appears to come from (it appears to come from behind the mirror). Here he is showing the classical way of...

Hello everyone, this is my first post so bare with me... I was searching the internet for light reflection and all other properties of light.Since we all know light requires a surface to reflect so that we see the objects. Can we reflect the light in space without requiring a surface?

In ch 30-7 of the Lectures, Feynman explains that the field of a plane of oscillating charges at a point P is proportional to the velocity of the charges, considered at the appropriate retarded time (retarded by the vertical distance from the point P). Feynman derives this formula only for...

Homework Statement When light reflects from a thin film back toward the source, what is the path length difference? The Attempt at a Solution A. It is equal to twice the thickness of the film. B. It is equal to the thickness of the film. C. It is equal to half the thickness of the...

Consider i m moving at a velocity considerable to the speed of light. Above me there is a mirror stretching to infinity . It doesn't move with me. Now if i shine light on the mirror where will the reflected beam hit me?right on me, back of me or infront of me?

If light is from electric source, would persons on places A, B and C register any light in any spectrum.

tif we presume that our finite universe has a boundary. This boundary is due to the pull of gravity. Light will slow down and then come back to us. 'i may be absolutely wrong in this'. My question is that the light we see will be from the stars surface that doesn't face us and star moving away...

Homework Statement For a beam of light shone on a prism, the reflected beams will give twice the angle of the prism. Homework Equations We know that the angle between the incident ray and the normal = angle between reflected ray and normal The Attempt at a Solution i tried drawing...

[b]1. A person riding in a boat observes that the sunlight reflected by the water is polarized parallel to the surface of the water. The person is wearing polarized sunglasses with the polarization axis vertical. If the wearer leans at an angle of 17.0 degrees to the vertical, what fraction...

Does anyone Know a program that can simulate light reflection in a 3d environment, to help me in my project "Solar Heliostat". I want the program to determine the angle of reflection and the size of the beam of light on the desired target.

You know when people say they have a craft out in space and use the sun light to move it by bouncing it off mirrors . so I take it you would never be able to get the craft back to where you launched it using light from the sun. Or would this work to get it back rotate the mirrors with an...

I took this photo in the Rijksmuseum Amsterdam. I hope it can be seen but the reflection of this silver thing is different colours in the different panes of glass. (Blue behind it, orange/red to the sides). What causes this effect? And why the particular colours...

Hello, I'm not sure if this is the right place as it's not quite a technical question, but I hope you guys can help me. I have a question about a certain situation involving reflection of light and how it effects color, and it requires somewhat of an 'artistic' eye. I had a little debate...

Hi. I need to write up a short one paragraph on a picture I took-- I just need hints or suggestions so I can go and research the effect myself. Any insights would be greatly appreciated. I have a picture of a traffic light (red). The ground is wet after rain. The red light is smeared out...

Hi, I'm new to this place, and I'm not sure if my problem fits with this forum, but I'll give it a try. Right now, I'm building a laser range finder, but my biggest concern will be focusing the reflected laser beam onto a small silicon photodiode. And to add to that, I have barely any...

Why are we not able to capture and store light between two mirrors? I'm going to take a guess at the answer but I'd like to hear from someone who knows for sure... I'm wondering if you actually can for a small amount of time, but the inefficiencies of an imperfect mirror cause some light to be...

Homework Statement A diver shines a flashlight upward from beneath the water at a 23.0° angle to the vertical. At what angle does the light leave the water? Homework Equations I thought that i could use snell's law here...but i don't know what to do afterwards... The Attempt at a...

Homework Statement It is 171 cm from your eyes to your toes. You're standing 210 cm in front of a tall mirror. How far is it from your eyes to the image of your toes? Homework Equations ? The Attempt at a Solution The answer which I got from the back of the book is 433cm. I have the...

A tiny layer of oil (n = 1.25) is situated on top of a water puddle (n = 1.33) in a parking lot. If the thickness of the oil is 242 nm, the what color(s) of visible light will give a strong reflection? 2t=m*lambda/n2 2t=242nm/1.25 and then 2t=242nm/1.33 i just don't know what goes where...

What are the ways that things can be reflected through flat, converging, and diverging mirrors? I know that for flat mirrors it's a virtual image equal to the size of the object For the converging mirror, if the object is placed farther than the radius of the mirror, the image is real and...

imagine that i have a pair of LEDs throwing light on the same point on a piece of paper. This is possible if the LEDs are inclined equally at an angle to the normal coming out of paper, right? now if i consider two rays hitting the paper at the same point, then where can i explain the...

Need urgent help with light reflection problems Here are my problems: 1) A beam of light has a wavelength of 610 nm in vacuum. a: What is the speed of this light in a liquid whose index of refraction at this wavelength is 1.45? I used n=c/v to get 2.07x10^8 m/s. This is correct. b: What is...

One thing that has allways disturbed my mind is the correct understanding of lightinteractions in nature. When we're talking about light reflection (light that is reflected in an arbitrary direction, not like mirrors) is it really reflections or is it new light created by the incoming light...