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fresnel lens

n.
1.lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length

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    Idiom of the Day

    turn on (something)
    to open or start something, to let water or electricity flow
    "Please turn on the radio so we can hear the evening news."



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    Bill: No, that's alright. If you don't answer it will just go through to my ________ and I can call them back later.

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