Why need a screen to display interference

In summary, a viewing screen is necessary in order to make measurements of interference patterns, but it is not essential for simply observing the patterns. Visible light refers to the portion of the electromagnetic spectrum that is visible to the human eye. We cannot see the actual wave itself, but rather the effects of the wave on the viewing screen. This is because the wavelength of visible light is too small to be seen by the naked eye. The light fringes in interference patterns are created by the invisible electric and magnetic fields of light.
  • #1
alkmini
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Homework Statement


why do we need a viewing screen in order to see interference patterns? why can we see interference patterns through our fingers when we look at a distant light source and we don't need a screen in that case?
what do we mean by visible light? can we see the wave itself, crests and toughs as we see in water waves? If we don't see it, is it because the wavelength is too small or because electromagnetic fields are invisible? if electric and magnetic fields are invisible then what are the light fringes in interference patterns?
:confused:


Homework Equations





The Attempt at a Solution

 
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  • #2
you are quite correct, it is not essential to have a viewing screen but if you want to make measurements of fringe separation, distance from double slits etc then you need to have the pattern visible on a screen of some sort.
The traditional school demonstration of Young's double slits experiment is done with a screen
 
  • #3
thanks a a lot
 

FAQ: Why need a screen to display interference

Why is a screen necessary to display interference?

A screen is necessary to display interference because interference is a phenomenon that involves the interaction of light waves. In order for us to observe and analyze this interaction, the light waves must be able to reach our eyes. A screen acts as a surface for the light waves to land on and helps us visualize the patterns created by the interference.

Can't we just observe interference without a screen?

It is possible to observe interference without a screen, but it would be much more difficult to see and analyze the patterns. The screen helps to amplify and clarify the interference pattern, making it easier for us to understand the behavior of the light waves.

Why can't we just use a plain white wall instead of a screen?

A plain white wall can reflect light, but it does not have the same properties as a screen. A screen is specifically designed to minimize reflection and maximize the visibility of interference patterns. Its surface is usually coated with a material that absorbs light, making it easier to see the patterns created by the interference.

Is a screen necessary for all types of interference?

No, a screen is not necessary for all types of interference. For some types, such as Young's double-slit experiment, a screen is essential to observe the interference pattern. However, for other types such as thin-film interference, the interference pattern can be observed without a screen.

Can we use any type of screen to display interference?

Ideally, a screen used to display interference should have a smooth, flat surface and be made of a material that absorbs light. This allows for better visualization of the interference pattern. However, in some cases, other surfaces such as paper or even water can be used to display interference patterns.

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