Hi everyone. I conducted an experiment, \"Double Slit Interference\" where I use

Question

Hi everyone. I conducted an experiment, "Double Slit Interference" where I used a laser and shone the light on sheets of paper to measure each order of interference (m=1, m=2). The tables above are the results, along with the calculated slit differences and percentage differences. The wavelength was given, 670nm.

I need help understanding what the percentage differences mean. Why do each order of interference percentage difference so greatly from each other? Also, what are possible sources of error when conducting a double slit interference experiment? Any help would be great!

Order of Slit Slit to screen Calculated Percentage Interference Distance separation difference slit difference separation (m) from center (D) to side orders) m-1 0.01m 0.0005m 11m 7.37 x 105 85.26% 1.47 x 104 70.52%l m 2 0.01m 0.0005m Table 1 Order of Slit Slit to screen Calculated Percentage Interference Distance separation difference (D) slit difference separation (m) from center to side orders) 0.009m 0.000 25m 1.1m 105 67.24% mE 1.47X10 41.04% 0 00025m 11m m 2 0.01m Table 2

Explanation / Answer

The main reasons due to which these error occurs migh be

(1) Though theoretically, LASER has zero divergence but practically its not so. Hence laser beam will spread with distance.

(2) Fringe widh is one observation which is used as to estimate slit seperation. Measurement of slit width and its precision play important role in estimating slit width.

(3) Boundary of slit might not be observed precisely.

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