Question

In a Young's double-slit experiment, the seventh dark fringe is located 0.025 m to the side of the central bright fringe on a flat screen, which is 1.1 m away from the slits. The separation between the slits is 1.5 × 10^-4 m. What is the wavelength of the light being used? To 3 significant figures

Answer 1

for dark finges in double slit experiment d sino = (m+y)? 7th dark 0-0251 •Central maxima here d is the seperation between the slits. 1.lm m = 6 Also tam o 0.025 0.0227 tam' (0.0227) 0 = 1.3° Now π = 1.5810 d sino (m + 54 X sin (1.3) (6+4) -7. ^= 5.24x10 M This is the wave length