When it comes to the Young's Double Slit Experiment, I'm just wondering

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SUMMARY

The Young's Double Slit Experiment demonstrates the wave-particle duality of light and the interference pattern created by coherent light sources. To accurately determine the distance between adjacent fringes, measuring the distance across multiple fringes and averaging the results is recommended to minimize measurement errors. Direct measurement using a ruler can introduce significant inaccuracies due to the limitations of the measuring instrument. Therefore, averaging measurements from five fringes enhances precision and reliability in experimental results.

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For the Young's Double slit Experiment, I'm just wondering when it comes to finding the distance between the adjacent fringes (shown on the screen), why can't we just measure directly the distance between the adjacent fringes instead of having to measure the distance between 5 fringes and dividing by 5. Can there be inconsistencies when it comes to measuring directly the distance between adjacent fringes? I'm really confused about this. HELP!
 
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the only reason is one of being accurate. My guess is that you did this using a ruler, which is not the most precise of instruments, and doing this reduces your imprecision five-fold.
 

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