# Single slit diffraction distance

• labview1958
In summary, as the width of the single slit increases, the distance between fringes in the diffraction pattern becomes more pronounced and the central bright fringe becomes smaller. This is contrary to what is expected and can be seen in applets on the internet. The formula for single slit diffraction suggests that as the slit width increases, the angle at which the minima occur will decrease, allowing for the observation of higher order minima. It is unclear whether the distance between fringes will increase or decrease as a result of increasing the slit width.
labview1958
What happens to the distance between fringes as the width of the single slit become larger? Does the distance between fringes increases? What happens to the centre bright fringe? Does it become larger with an increasing single slit width? My hunch is: Increasing the width increases the size of the bright central fringe, but applets on the net show otherwise. Can someone help?

from

http://www.walter-fendt.de/ph14e/singleslit.htm

If the width of the slit increases, the diffraction pattern becomes more pronounced. It should be otherwise. Do you agree?

If you look at the formula for single slit diffraction you see that at a given wavelength if you increase the size of the slit then the angle at which the minima occur will decrease. Hence we will be able to see further higher order minimas.

Increasing slit width will decrease or increase the distance between fringes?

As the width of the single slit increases, the distance between fringes does indeed increase. This is because the width of the slit affects the diffraction pattern, causing the diffracted waves to spread out more, resulting in a wider fringe pattern. However, the distance between fringes does not increase proportionally to the width of the slit. In fact, the distance between fringes increases at a slower rate than the slit width. This is because the fringe pattern is also affected by the wavelength of the light used, and as the slit width increases, the diffraction pattern becomes more complex.

The center bright fringe, also known as the zeroth order maximum, does become larger with an increasing single slit width. This is because the center bright fringe is the result of constructive interference of all the diffracted waves passing through the center of the slit. As the slit width increases, more waves are able to pass through the center, resulting in a larger and brighter central fringe.

However, it is important to note that this effect may not be easily visible to the naked eye, especially for small changes in the slit width. This is why the applets may not show a significant difference in the size of the central fringe with changing slit width. Additionally, other factors such as the intensity of the light source and the distance between the slit and the screen may also affect the visibility of the central fringe.

Overall, increasing the width of the single slit does affect the distance between fringes and the size of the central bright fringe, but the exact relationship between these variables is complex and may not be easily observable in certain cases.

## 1. What is single slit diffraction distance?

Single slit diffraction distance refers to the distance between the single slit and the screen or detector where the diffraction pattern is observed.

## 2. How is single slit diffraction distance calculated?

The single slit diffraction distance can be calculated using the equation d*sin(theta) = m*lambda, where d is the width of the slit, theta is the angle of diffraction, m is the order of the diffraction pattern, and lambda is the wavelength of the incident light.

## 3. What factors can affect the single slit diffraction distance?

The single slit diffraction distance can be affected by the width of the slit, the wavelength of the incident light, and the distance between the slit and the screen or detector. It is also influenced by the presence of other obstacles or slits in the path of the light.

## 4. How does the single slit diffraction distance relate to the intensity of the diffraction pattern?

The single slit diffraction distance directly affects the intensity of the diffraction pattern. As the distance increases, the intensity of the diffraction pattern decreases due to the spreading out of the diffracted waves.

## 5. Why is the single slit diffraction distance important in understanding diffraction patterns?

The single slit diffraction distance is important because it determines the size and shape of the diffraction pattern observed. It also provides information about the properties of the incident light, such as its wavelength and the size of the slit. Understanding the single slit diffraction distance is crucial in studying the behavior of light and its interactions with matter.

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