What is Young’s double-slit experiment?

Young’s double-slit experiment is a clever way to show that light can act like waves, just like ripples on a pond.

Imagine you're at the beach, and there's a small wall with two narrow holes in it. When waves come from the ocean and hit this wall, they go through both holes and spread out again, creating a pattern of overlapping ripples on the sand. That’s what happens in Young’s experiment, light is like those waves.

In the experiment, light passes through two tiny slits, just like water passing through two openings in a wall. On the other side, instead of ripples on the beach, you see lines of brightness and darkness, called a pattern. This pattern shows that the light waves are overlapping, some parts cancel each other out (making dark lines), and others add up (making bright lines).

Think of it like two friends tossing pebbles into a pond at the same time. Each pebble makes ripples, and where they meet, they create new patterns on the water. That’s how light behaves in this experiment, like waves meeting and playing together!