is a rainbow a type of shadow?

No, it is not. A rainbow results from the refraction and internal reflection of light as it passes through raindrops.

Imagine looking behind a mirror. The light has been, for the argument's sake, completely reflected, so it is blocked from the back side. That area, where the light is blocked is the shadow. It is only considered a shadow if the light blocked is distinct enough to notice. Yet, even that spot is not pitch black, because other light fills this void. The distinction of the shadow comes from this ambient light being noticably less than the direct light.

A rainbow exists in a different manner. It is defined by the light that does come through, and ignores the ambient light's intensity, to a greater degree. In a rainbow, light is refracted. It is split up, as it passes through a substance, into a range of frequencies(or colors). We view the same light that started, but in it's "individual parts".

No, SHADOWS are where light is BLOCKED. Rainbows is where light is bent and scattered out.

No, it is not. A rainbow results from the refraction and internal reflection of light as it passes through raindrops.

No, it isn't a shadow, a shadow is black and it's of something that it actually there. A rainbow forms when the sunlight shines through the raindrops, hence why it needs to be raining and sunny at the same time and the raindrops act like a prism separating out all the colours in the visible spectrum.

No, rainbow is not a type of shadow

It's more like a mirror or prism than a shadow.

No

no. a rainbow is a reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky.

No its a reflection