The bed of nails principle states that while laying on one nail is enough to puncture a person’s skin, laying on many distributed nails isn’t.
Physics is a natural science concerned with the study of matter and it’s relation to space and time. It looks at concepts related to this like energy and force in order to understand the behaviors of the universe.
All elementary particles exhibit wave-particle duality, acting as both a particle and a wave.
“Light” is a particle (photon), that acts like a wave, and is understood as a localized vibration in the electromagnetic field.