Answer:
The phenomenon of total internal reflection of light is used in many optical instruments like telescopes, microscopes, binoculars, spectroscopes, periscopes etc. The brilliance of a diamond is due to total internal reflection. Optical fibre works on the principle of total internal reflection.
Explanation:
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The item in question is known as a web search engine. These services will crawl websites and gather information about web pages to present to the searching user based on the search terms compared to the content of the webpage.