Some alpha particles deflect less that other why is that?

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.