The wavelength of the Helium-Neon laser is 632.8 nm. 1) For the single-slit diffraction experiment, calculate the slit width, a. Calculate its average and estimate the uncertainty. Y= Dtano a sine = ma Y = MAD m AD - a = a Y Wavelength A = 6.328 x 10-7 m Distance screen and laser, D- 1.20 m Y average = 0.45 cm= 0.0045 m Y 0.0045 m Tan 0 = - D = 0.00375 1.20 m 0 = arctan( 0.00375) = 0.215 0 ~ 0.220 a sino = m> > m=1 1x 6.328 x 10-7 a = sin(0.2150 ) = 1.69 x 10 m = 0.0169 cm sine Also: MAD 1x 6.328 x 10-7 x 1.20 a = Y 0.0045 = 1.69x 10-4m = 0.0169 cm UNCERTAINTY