Solve the following problem given below:
Problem: Coherent light that contains two wavelengths, 660nm and 470nm , passes through two narrow slits with a separation of 0.290mm and an interference pattern is observed on a screen which is a distance 4.90m from the slits.
A- What is the distance on the screen between the first order bright fringes for each wavelength?
Please show me how you do the above problem. Thanks.