# Diffraction Orders: Tilted Light Arrays & Incident Lights

In summary, diffraction can occur for tilted light arrays and not just for normal incident lights, as all light diffracts when its path is restricted. The math for normal incidence cases is simpler, which is why it is usually taught in introductory lessons. However, you can still observe diffraction from tilted light arrays, such as diffraction gratings. This thread was originally discussing Bragg diffraction of X-rays from a crystal, but was later moved to this forum.
Can diffraction be explained for tilted light arrays or only normal incident lights can have diffraction orders?

All light diffracts when it's path is restricted - so you can have diffraction when the light is not normal incidence on the diffraction grating. The reason you are taught the normal-incidence case is that the math is simpler.

You can try it out and see.

1 person
Diffraction from what? What is the light shining onto? What kind of diffraction are we talking about here?

Diffracted from "tilted light arrays" ... English is a second language perhaps? The interpretation is reinforced by the reference to the angle of incidence and a perusal of introductory lessons in diffraction. We would say "diffraction gratings" in the same place.

Still - that is a guess: I could be wrong :)

This thread was originally in the "Atomic, Solid State, etc." forum, so my first thought was Bragg diffraction of X-rays from a crystal. But that confused me, because with Bragg diffraction you usually do analyze it with the light coming in at an angle!

Another mentor moved it here later.

## 1. What is diffraction and how does it relate to light arrays?

Diffraction is the bending and spreading of light waves as they pass through a narrow opening or around an obstacle. In the context of light arrays, diffraction occurs when light passes through an array of slits or openings, resulting in a pattern of diffracted light called a diffraction pattern.

## 2. What are diffraction orders and how are they created?

Diffraction orders refer to the different intensity peaks or spots in a diffraction pattern. They are created as a result of constructive and destructive interference of light waves passing through the slits or openings in the light array.

## 3. How do tilted light arrays affect diffraction patterns?

Tilted light arrays can cause the diffraction pattern to shift or become distorted. This is because the slits or openings are no longer parallel to the direction of the incident light, resulting in a change in the angle of diffraction and therefore, a different diffraction pattern.

## 4. What is the relationship between incident light and diffraction patterns?

The incident light is the light that is shone onto the light array, and it determines the angle and intensity of the diffracted light. The properties of the incident light such as wavelength, angle of incidence, and polarization can all affect the diffraction pattern that is produced.

## 5. Can diffraction orders be controlled or manipulated?

Yes, diffraction orders can be controlled and manipulated by changing the properties of the incident light or by altering the structure of the light array. For example, using a different wavelength of light or changing the spacing between slits in the array can result in a different diffraction pattern with different diffraction orders.

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