What is the reason for allowing light to pass through the double -slits S1 and S2?

The reason for allowing light to pass through the double-slits S1 and S2 in a double-slit experiment is to create an interference pattern. When light passes through the two slits, it creates two coherent sources of light waves that interfere with each other. This interference pattern can be observed on a screen placed behind the slits, showing alternating bright and dark fringes. This phenomenon helps to demonstrate the wave-like nature of light and can provide valuable insights into the behavior of light waves.

The reason for allowing light to pass through the double-slits S1 and S2 is to create an interference pattern on a screen placed behind the slits. When light passes through two closely spaced slits, it creates two coherent sources of light that interfere with each other. This interference produces alternating bright and dark bands on the screen, which is known as an interference pattern. By studying the interference pattern, scientists can learn about the nature of light, the behavior of waves, and the structure of atoms.