1. The third-order dark fringe of light with a wavelength of 652 nm light is observed when the light passes through two narrow slits onto a screen. The slit distance is 6.3 x 10^-6 m. At what angle is the fringe observed? (15 degrees) 2. Two slits are separated by 0.20 mm and produce an interference pattern. The fifth maximum is 12.8 cm from the central maximum. The wavelength of the light used is 550 nm. Determine the distance at which the screen is place (L = 9.3 m) 3. A double-slit experiment is carried out with slit spacing d = 0.41 mm. The screen is at a distance of 1.5 m. The bright fringes at the centre of the screen are separated by a distance Ax = 1.5 mm. a) Determine the wavelength of the light (4.1 x 10^-7 m) b) Determine the spacing of the bright fringes when a source with a wavelength 600 nm is used. (A x= 2.2 x 10^-3 m) 4. In an interference experiment, red light (600 nm) passes through a double slit. On a screen 1.5 m away, this distance between the 12 and 11th dark bands is 13.2 cm. a. What is the spacing between adjacent nodal lines? (A x= 1.32 cm) b. What is the separation of the slits? (d = 6.8 x10^-5 m) c. What would the spacing be, between adjacent nodal lines, if blue light (450 nm) were used? (A x= 9.9 x 10^-3 m)