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wave front

n.
1.all the points just reached by a wave as it propagates
2.(physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium

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    Idiom of the Day

    eyes in the back of one's head
    the ability to know what is happening behind one`s back
    The man has eyes in the back of his head and you can never borrow anything without him knowing about it.



    1.
    Being a well known physicist (a) / he was invited (b). / to deliver (c) / a lecture on Laser technology. (d) / No error (e)

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