# L19 - L19 Interference and Diffraction Part A 1 2 L(m d(mm...

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L19: Interference and Diffraction Part A 1.

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2. L (m) d (mm) m y (cm) λ (nm) Deviatio n in λ (nm) 8.36 0.127 -1 4.2 638 7 +1 4.4 668 23 0.169 -1 3.2 647 2 +1 3.1 627 18 Means: 645 12.5 Percentage mean deviation: 1.94 4. red; 671 nm; http://en.wikipedia.org/wiki/Laser_pointer 5. Experimental Error=|experimental value-accepted value|/accepted value*100 =|645 nm-671 nm|/671 nm * 100 =3.87% 6. a. The laser is put on top of a couple textbooks which are on a table to ensure stability. I faced the laser towards a white board. I taped the slit image to the laser so that the produced image was steady. b. I used a tape measure to measure the distance from the double slit to the white board.
c. I taped a sheet of paper on the wall where the fringes were. I traced the image onto a blank sheet of paper and measured the distance from the tracing. 7. The percentage mean deviation of my measurements do not account for the experimental error because my percentage mean deviation is 1.94% and my experimental error is 3.87%. Since my experimental error is greater than my

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