Why need a screen to display interference

AI Thread Summary
A viewing screen is essential for observing and measuring interference patterns, as it allows for clear visualization of fringe separation and distances in experiments like Young's double slits. While interference patterns can be seen indirectly through objects like fingers when viewing distant light sources, a screen provides a controlled environment for accurate measurements. The discussion also touches on the nature of visible light, questioning whether we can perceive the wave properties like crests and troughs, which are not visible due to their small wavelength and the invisibility of electromagnetic fields. Light fringes in interference patterns are manifestations of these wave properties, despite our inability to see the waves themselves. Overall, a screen enhances the clarity and precision of interference pattern observations.
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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:


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The Attempt at a Solution

 
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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
 
thanks a a lot
 

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