<P> The design Galileo Galilei used in 1609 is commonly called a Galilean telescope . It used a convergent ( plano - convex ) objective lens and a divergent ( plano - concave ) eyepiece lens ( Galileo , 1610 ) . A Galilean telescope , because the design has no intermediary focus , results in a non-inverted and upright image . </P>
<P> The design Galileo Galilei used in 1609 is commonly called a Galilean telescope . It used a convergent ( plano - convex ) objective lens and a divergent ( plano - concave ) eyepiece lens ( Galileo , 1610 ) . A Galilean telescope , because the design has no intermediary focus , results in a non-inverted and upright image . </P>
the eye piece of the galilean telescope uses
the eye piece of the galilean telescope uses
convergent ( plano - convex ) objective lens
convergent ( plano - convex ) objective lens