Why does the full Moon appear?

Question

I know that the full Moon appears when Sun, Moon and Earth are in a straight line, but if we consider that they are in straight line, why is the Moon illuminated?I mean to say that Earth should block all the rays of the Sun and shouldn't allow any light ray to reach the Moon. In this case the moon should not get illuminated as no light has reached it which it can reflect back. Then why do we see a fully illuminated hemisphere of the Moon?

Answer 1

Read this: https://earthsky.org/?p=916

Basically, although the e, s, m are in a "line, the shadow of the earth is not obscuring the moon because it (the shadow) is projected else where. When the shadow of the earth does project on the moon, we call it a lunar eclipse. Look at the picture referenced above.