The separation of the fringes in the previous problem is inconveniently small and hard to see. To fix that, suppose we double the distance from the slits to the viewing screen, and also reduce the slit separation to 0.240 mm, keeping everything else constant. Determine the new fringe spacing.

Previous problem

In Young’s experiment using monochromatic light at a vacuum wavelength of 589.3 nm, the two narrow slits are separated center to center by 2.40 mm. Determine the spacing between successive bright bands on a screen 1.00 m away. Explain your answer.