Why is the edge of the light from my flashlight beam so blurry?

[somega]

On the photo you can see:

Red 1: the edge is very sharp (as expected)
Red 2: the edge is very blurry (but why?)

Same for green.

You can also see (Red 2) that the blurry edge is yellow.

What is this effect called?

 

[A.T.]

View attachment 259524

On the photo you can see:

Red 1: the edge is very sharp (as expected)
Red 2: the edge is very blurry (but why?)

Same for green.

You can also see (Red 2) that the blurry edge is yellow.

What is this effect called?

Green: Because the light source is not a single point, the shadows are blurry.
Red: Same as green but also:
https://en.wikipedia.org/wiki/Chromatic_aberration