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optics

n.
1.the branch of physics that studies the physical properties of light

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Word of the Day

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    Idiom of the Day

    make no difference to (someone)
    to not matter to someone, to not care (about something)
    It makes no difference to me if we go to the movie on Friday or on Saturday.



    1.
    I shall not ________ my right to this house, unless you promise to give me another one.

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