What layer are you looking at when you look at an image of the sun?

The sun does not have a solid surface, but the gases of the photosphere are thick enough to be visible. When you look at a typical image of the sun, you are looking at the photosphere. It is considered to be the sun's surface layer.

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.