Question

Explain the construction of Galileo’s telescope.

Answer 1

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.
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Answer 2

Galileo’s telescope was a simple arrangement of lenses with optician’s glass fixed to either end of a hollow cylinder to magnify objects.

• The original telescope made by Galileo consisted of a main tube and two smaller semicircular housings in which the objective and the eyepiece are mounted.

• The objective lens was convex and the eyepiece/eye lens was concave.
• The two semicircular tubes held together with copper wire.
• It is covered with paper.

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