Step 1: Understand the double-slit experiment. It involves shining light through two closely spaced slits to create an interference pattern on a screen.
Step 2: Know the formula for fringe separation (β), which is β = λD/d. Here, λ is the wavelength of light, D is the distance from the slits to the screen, and d is the distance between the slits.
Step 3: Identify what happens when the wavelength (λ) increases. According to the formula, if λ increases, then β (fringe separation) will also increase, assuming D and d remain constant.
Step 4: Conclude that increasing the wavelength of light results in wider spacing between the bright and dark fringes on the screen.
