4.7 Exercise 4

White light falls on two narrow slits separated by 0.40 mm. The interference pattern is observed on a screen 3.0 m away. (a) What is the separation between the first maxima for red light $\left(\lambda = 700 \text{nm}\right)$ and violet light $\left(\lambda = 400 \text{nm}\right) ?$ (b) At what point nearest the central maximum will a maximum for yellow light $\left(\lambda = 600 \text{nm}\right)$ coincide with a maximum for violet light? Identify the order for each maximum.