# Doubt in a figure which explains rainbow formation

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°.

• An angle isn't specified in the attached image, so it's hard to tell, but what isn't hard is how the rays closest to the boarder line that barely refracted as they went through the drop was completely refelcted at the back of it. I believe the image is meant to illustrate rather than providing an detailed or precise optical diagram. Commented Mar 3, 2019 at 4:49
• "completely refelcted at the back of it". why do they completelly reflected at back of raindrop. can you explain it.
– teja
Commented Mar 3, 2019 at 4:52
• It's not suppose to do that so close to the normal, so the image is partially inaccurate. It's rather a descriptive image. Commented Mar 3, 2019 at 5:03