Why slit should be narrow and vertical in fresnel biprism?
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hey mate here is your desired answer ❤
✔✔To get interference, you need a precise path difference between two beams of light. If you have a wide slit, light could have passed in many places - and from there to the screen there are many different path lengths possible.
✔✔When this happens, you don't get a clear interference pattern. We say that the narrow slit makes the source "spatially coherent".
✔✔To get interference, you need a precise path difference between two beams of light. If you have a wide slit, light could have passed in many places - and from there to the screen there are many different path lengths possible.
✔✔When this happens, you don't get a clear interference pattern. We say that the narrow slit makes the source "spatially coherent".
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