Optics/Evidence for light as a stream of particles

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:

$p({\text{particle}})=mv$

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:

$\lambda ={h \over p}$

or

$p({\text{EM}})={h \over \lambda }$

Applying $p=mv$, we get:

$\lambda ={h \over {mv}}$

Rearranging the above equation, we have:

${h \over \lambda }=mv$

Which is equivalent to:

$p({\text{EM}})=p({\text{particle}})$

Therefore, we conclude that an electromagnetic wave is just a stream of particles and vice-versa.