Imagine the spectral photons as being canon balls; spinning at high speed; creating a front end view like a hollow point bullet. A violet colored photon having a very small mass; has also a very small front end view. The effect is that a light speed ball, creates a bow wave which is in effect a doughnut ring of progression; at light speeds. Each of the colors of the visible spectrum have a ring of progression which differs in its size of axial progression; and consequently when it hits a curved surface of a convergent lens; it is mandated to refract at its exact and specific angle of refraction.

That means that each color of photon has a specific mass; for each of the seven colors. Having that specific mass; demands that only that photonic mass; color; and rate of refraction; around its specific diameter of axial spin; can refract at that specific angle.

The violet light doughnut can turn at a very sharp angle of refraction; when compared to say the red light photon; which has a much larger donut of impact; due to its much larger mass; and diameter of axis of spin.

Inside a radiometer; there is no atmosphere; so there can be no bow wave; only the photon particle is there to make the vane move. Therein; is the proof of the power of the impact; and mass of the photon particle.

A wave is a creation composed of lots of tiny pieces; of whatever medium that surrounds a particle. Those many pieces are separating as the wave moves in its forward progression.In effect; the wave is spreading out or dissipating as it travels. A photon of light goes right thru a window pane; a pulse of air is reflected back.

Occams razor uses simple answers; in quest of truth; I will loan you my razor; if you would like to borrow it.