Doubt in a figure which explains rainbow formation

Question

This figure is given in wikipedia to explain rainbow formation,

l know that if light travels from denser medium to rarer medium and if angle of incidence is greater than crictal angle light will reflect back frmo inner surface of drop, but here in this figure a parallel ray(paraxial rays) to diameter is shown as reflecting back from surface.

It is clear from figure that they do not make angle more than critical angle,

I want to know whether it is partial reflection or total internal reflection of paraxial rays.

https://en.wikipedia.org/wiki/Rainbow

This sentence is also given in wikipedia:

The overall effect is that part of the incoming light is reflected back over the range of 0° to 42°, with the most intense light at 42°.

Answer 1

It's a partial reflection.

For an ideal sphere, it's not possible for an external ray to achieve total reflection. Any ray that enters must necessarily be at less than the critical angle. This ray will intersect the sphere at two points, and the angle it creates with the surface of the sphere will be identical. Therefore it will be below the critical angle at both surfaces.

Not shown is that a percentage of the light will leave and not reflect at each intersection.

The important thing in that image is that regardless of where incoming ray strikes, there is a maximum deviation possible when there are two reflections. This maximum angle depends on the refractive index.