What type of light source is used in Young's double slit experiment? Explain your answer?

In Young's double slit experiment, a coherent light source is used. Coherent light is light that has a constant phase relationship between the waves, meaning that the peaks and troughs of the waves are aligned. This is important for the interference pattern to be observed in the experiment.

When coherent light passes through the double slits, it creates two coherent sources of light that interfere with each other, producing an interference pattern on a screen placed behind the slits. This pattern is a result of the constructive and destructive interference of the light waves, which can only occur with coherent light.

Common sources of coherent light used in Young's double slit experiment include lasers and monochromatic light sources, which emit light of a single wavelength. These sources produce light waves that are in phase with each other, allowing for the formation of the interference pattern that is characteristic of the experiment.

A coherent light source such as a laser is used in Young's double slit experiment.

Coherence refers to the ability of a light source to emit light waves that are in phase with each other. In Young's double slit experiment, it is essential to use coherent light to ensure that the light waves from the two slits interfere with each other to produce the characteristic interference pattern.

If an incoherent light source such as a regular light bulb were used, the light waves from the two slits would be emitted randomly and would not be in phase with each other. As a result, the interference pattern would not be visible.