Iwill mark as the brainliest answer

By bonding, there is a sharing between them of electrons, resulting in 8 in the valence shell of all the atoms, following the octet rule. Helium however, only has room for two electrons in its only valence shell and it is stable. Therefore, it does not follow the octet rule.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

and 1and 1