How Are Mirrors Made?

This film, from Twg World, looks at the process of manufacturing glass into sophisticated mirror systems in the world's largest telescopes.

The key points made in the film are:

•Mirrors are made from glass, which is melted and spread over a base.

•Telescopes use mirrors to focus light onto a detector, which allows us to see deep into space.

•The larger a telescope's mirror, the more light it lets in.

•The largest mirror ever made measured 8.4m wide, using 23 metric tonnes of glass.

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