Optics/Evidence for light as a stream of particles
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Light is the thing we define as the visible part of the spectrum of electromagnetic waves.
With the help of the impulse of a particle and the impulse of a(n) (electromagnetic) wave, evidence for light being a stream of particles and vice versa can be found.
The impulse/momentum of a "normal particle" is defined as:
A scientist named Louis de Broglie found that the wavelength of an electromagnetic wave can be approached with planck's constant and the impulse of the waves. The formula looks like this:
or
Applying , we get:
Rearranging the above equation, we have:
Which is equivalent to:
Therefore, we conclude that an electromagnetic wave is just a stream of particles and vice-versa.