Example:white light passes through two slits 0.50 mm apart and an interference pattern is observed on a screen 2.5 m away.The first-order fringe resembles a rainbow with violet and red light at either end.The violet light falls about 2.0 mm and the red 3.5 mm from the center of the central white fringe.Estimate the wavelengths of the violet and red lights Solution: since k=1 for violet light,we will have: 元400400 For red light: 1Example: white light passes through two slits 0.50 mm apart and an interference pattern is observed on a screen 2.5 m away. The first-order fringe resembles a rainbow with violet and red light at either end. The violet light falls about 2.0 mm and the red 3.5 mm from the center of the central white fringe. Estimate the wavelengths of the violet and red lights Solution: since k=1 , for violet light , we will have: For red light: