How do light house work? 

This video gives a broad understanding of a light house, it's purpose, features and the history. This video is in kannada language. and related videos and images are taken from different sources.
some sources are :
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Video is for educational purpose only. Copyright Disclaimer under section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favour of fair use
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