# Double-Slit with Natural Light?

• Codeman
In summary, Double-Slit with Natural Light can be done by using sunlight that enters the room through a pinhole in a window shutter. A mirror is used to direct the pinhole beam horizontally across the room. Thomas Young used a small paper card to break the single pinhole beam into two beams and observed an interference pattern on a screen.

#### Codeman

Double-Slit with Natural Light?

Hi,

I would like to know if it is possible to perform the double-slit experiment with natural lighting conditions. I work with photograhy and would like to know if there is a way to capture the "interference patter" of a particular scene (i.e. ocean, landscape, building, etc.). I know its an odd request but there has to be a way to get the light that would enter a Pinhole Camera, for example, to do the same thing but form an interference pattern of the image being exposed. How could I do this? Please help if you can...

Thanks you,

Codeman

I believe the original experiment was done with sunlight refracted through a lense then split by a thin card. I would think a properly designed camera lense would do it too. It does say that the pattern is more defined using one color of light so maybe a colored filter would help too.

Codeman said:
Hi,

I would like to know if it is possible to perform the double-slit experiment with natural lighting conditions. I work with photograhy and would like to know if there is a way to capture the "interference patter" of a particular scene (i.e. ocean, landscape, building, etc.). I know its an odd request but there has to be a way to get the light that would enter a Pinhole Camera, for example, to do the same thing but form an interference pattern of the image being exposed. How could I do this? Please help if you can...

Thanks you,

Codeman
Yes, double-slit experiment can be done with natural light. After all, laser wasn't invented when Thomas Young did his experiment. The light coming out of the two slit actually interference with itself. What is needed is the radius of the hole is approximately equal to the wavelenth of light. I guess a normal pinhole camera can't satisfy this condition. But it would be interesting to see how a landscape look like in your way.

GOD__AM said:
I believe the original experiment was done with sunlight refracted through a lense then split by a thin card. I would think a properly designed camera lense would do it too. It does say that the pattern is more defined using one color of light so maybe a colored filter would help too.

Yeah, I noticed there's a card-splitting version [url[/URL] but with a laser.

Some other info:

[QUOTE]In 1801, Thomas Young devised and performed an experiment demonstrating the wave nature of light. The difficulty confronting Young was that the usual light sources of the day (candles, lanterns, etc.) could not serve as coherent light sources.

Young's method involved using sunlight that entered the room through a pinhole in a window shutter. A mirror was used to direct the pinhole beam horizontally across the room. Young used a small paper card to break the single pinhole beam into two beams and observed an interference pattern on a screen.

[PLAIN]http://courses.washington.edu/p123cs05/Lectures/Physics123C_L11.ppt [Broken][/QUOTE]

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Thanks for all of your replies.

Also, if using a card to split the beam doesn't work for me couldn't I just have two holes/slits with there distance matching the wavelength of the light at a given part of the day? If I had a lens that focused the light and two slits behind the lens wouldn't this give me an interference pattern?

Thank you all...

You'll want to have as monochromatic light as possible (or film that is sensitive to only one frequency/color), if you want as sharp an interference as possible. This is cause the interference depends on the wavelength of the light.

Carl

Information and a nice little applet to show what happens when you adjust things about the two-slit experiment:

http://www.thespectroscopynet.com/Educational/Diffraction.htm

It has the numbers for the distances involved. I guess you could use coloured filters to get the monochromatic light.

I don't know if diffraction gratings might be any good for the effect. There's a lot of info on them.

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This may help it shows doing the experiment with a pvc pipe and a ccd camera. Just need to work out how to focus the light coming into the pipe. Good luck post pics if you get it too work.

http://www.fas.harvard.edu/~scdiroff/lds/QuantumRelativity/SinglePhotonInterference/SinglePhotonInterference.html

## 1. How does the double-slit experiment with natural light work?

The double-slit experiment with natural light involves shining a beam of natural light through a small hole onto a screen with two narrow slits. The light passing through the slits will interfere with each other, creating a pattern of light and dark bands on the screen. This is due to the wave-like nature of light and the phenomenon of interference.

## 2. What is the significance of the double-slit experiment with natural light?

The double-slit experiment with natural light is significant because it provides evidence for the wave-like nature of light. It also demonstrates the concept of interference, which is a fundamental principle in understanding the behavior of light and other waves.

## 3. Can the double-slit experiment with natural light be explained by classical physics?

No, the double-slit experiment with natural light cannot be fully explained by classical physics. The wave-like behavior of light can only be explained by quantum mechanics, which is a more accurate theory for understanding the behavior of particles at the microscopic level.

## 4. Are there any variations of the double-slit experiment with natural light?

Yes, there are variations of the double-slit experiment with natural light, such as using different types of light sources (e.g. laser, incandescent bulb), changing the distance between the slits, or using different materials for the slits. These variations can produce different interference patterns and provide further insight into the nature of light.

## 5. What are the practical applications of the double-slit experiment with natural light?

The double-slit experiment with natural light has practical applications in fields such as optics and telecommunications. It is also used in the development of new technologies, such as quantum computers, which rely on the principles of quantum mechanics demonstrated in the experiment.