Photons in the light have the property of particle-wave duality. This means they can behave as both particles and waves. Because of this light does not require a medium for propagation. They can travel through a vacuum.

The speed of light in a vacuum is 186, 282 miles per second.

The work demonstrates that, after passing the light beam through a mask, photons move more slowly through space. This finding shows unambiguously that the propagation of light can be slowed below the commonly accepted figure of 299,792,458 metres per second, even when travelling in air or vacuum.

Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.

Light is not visible in a vacuum. If we see lighten up surroundings, they are glowing concentration of molecules that we see. Light itself is not visible.

September 2016) (Learn how and when to remove this template message) Rectilinear propagation describes the tendency of electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density. This is called refraction.

Hint: Light travels in a straight line because the diffraction effect is least due to the small wavelength of light. So the small wavelength of light produces negligible diffraction and therefore light travels along a straight line.

The answer: Yes. In a 2016 Nature paper, Simon described building a two-dimensional material out of photons, the tiny packets of energy that make up light, and teaching them to behave like electrons, elementary particles that make up matter.

Light is not matter. Light is made up of “things” called photons, and these photons can possess some of the properties of matter. For example, they are always moving, and when they move, they can exert a (usually very small) force on an object (just like moving matter can). But most of the time, light is just light.