4. Two slits spaced 0.460 mm apart are placed a distance of 76.5 cm from a screen. a) When the slits are illuminated with coherent light with a wavelength of 550 nm, What is the distance between the center and the 1" bright line on the screen? b) What is the distance between the second and third dark lines of the interference pattern on the screen? c) If you change the light with purple light( the wavelength is 400 nm), are those interference lines are close or far from the center comparing with the light with 550 nm?

4. Two slits spaced 0.460 mm apart are placed a distance of 76.5 cm from a screen. a) When the slits are illuminated with coherent light with a wavelength of 550 nm, What is the distance between the center and the 1" bright line on the screen? b) What is the distance between the second and third dark lines of the interference pattern on the screen? c) If you change the light with purple light( the wavelength is 400 nm), are those interference lines are close or far from the center comparing with the light with 550 nm?