This film, from Twig World, looks at who invented telescopes and how they have developed throughout history.

The key points made in the film are:

•The first optical telescopes were made around 1608. •Early telescopes consisted of a convex lens and an eyepiece.

•Later telescope designs used multiple concave mirrors to reflect light.

•Modern telescopes can be used to view the entire electromagnetic spectrum, from radio waves through to gamma rays.

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