Railways R.R.C. (Kolkata) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    A periscope works by the principle of?

    A) diffraction

    B) reflection and interference

    C) reflection and refraction

    D) refraction only

    Correct Answer: C

    Solution :

    Simple periscope uses two plane mirrors which functions on the principle of reflection. A periscope used by a submarine consists of a prism and telescopic lenses.


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