Consider the Young's Double-Slit apparatus sketched below. Point P is at the position of the fourth bright fringe above the center of the pattern as shown. The light used has wavelength=600 nm. Let the distance from the upper slit to a point on the screen be r1 and the distance from the lower slit to that point on the screen be r2. Note that these distances change as different screen points are considered. A) What is r2 - r1 at the center of the pattern? B) What is r2- r1 at the point P? C) Find the slit separation d. D) What is the distance from the center of the fringe pattern to the position of the third fringe above the center? Laser Beam 2 m 10 cm

Consider the Young's Double-Slit apparatus sketched below. Point P is at the position of the fourth bright fringe above the center of the pattern as shown. The light used has wavelength=600 nm. Let the distance from the upper slit to a point on the screen be r1 and the distance from the lower slit to that point on the screen be r2. Note that these distances change as different screen points are considered. A) What is r2 - r1 at the center of the pattern? B) What is r2- r1 at the point P? C) Find the slit separation d. D) What is the distance from the center of the fringe pattern to the position of the third fringe above the center? Laser Beam 2 m 10 cm