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collimator

n.
1.a small telescope attached to a large telescope to use in setting the line of the larger one
2.optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens

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    Idiom of the Day

    promise (someone) the moon
    to promise something that is impossible
    Before the election the politicians promised everybody the moon but after they were elected they began to talk differently.



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