SSC General Science & Technology Sample Paper NCERT Sample Paper-4

  • question_answer
    Optical Tweezers

    A)  Are used to remove facial hair with miniaturised laser beams

    B)  Use light to manipulate particles as small as a single atom

    C)  Are a Nano technology based tool for stamp collectors

    D)  Don?t exist

    Correct Answer: B

    Solution :

    [b] Optical tweezers (originally called "single-beam gradient force trap") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects similar to tweezers. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.

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