Telescope

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A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally it was an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects – an optical telescope. Nowadays, the word "telescope" is defined as wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.

The first known practical telescopes were refracting telescopes with glass lenses and were invented in the Netherlands at the beginning of the 17th century. They were used for both terrestrial applications and astronomy.
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  • Fotó szaküzlet Budapest 1960.

    Fotó szaküzlet Budapest 1960.

    A képen egy Ofotért optikai...

    Object information
    Image: Magyar Kereskedelmi és Vendéglátóipari Múzeum - CC BY-NC-ND

  • Fotó szaküzlet Budapest

    Fotó szaküzlet Budapest

    A képen a budapesti Múzeum...

    Object information
    Image: Magyar Kereskedelmi és Vendéglátóipari Múzeum - CC BY-NC-ND

  • Fotó szaküzlet Budapest 1960.

    Fotó szaküzlet Budapest 1960.

    A képen egy Ofotért optikai...

    Object information
    Image: Magyar Kereskedelmi és Vendéglátóipari Múzeum - CC BY-NC-ND

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