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AMU Medical AMU Solved Paper-2010

  • question_answer
    Pick out rhe correct statements about optical fibres from the following. S1 : Optical  fibres  are  used  for the transmission of optical signals only. S2 : Optical fibres are used for transmitting and receiving electrical signals. S3 : The intensity of light signals sent through optical fibres suffer very small loss. S4: Optical fibres effectively employ the principle of multiple total internal reflections. S5 : Optical fibres are glass fibres coated with a thin layer of a material with lower refractive index.

    A)  S1 and S2           

    B)  S2 and S3

    C)   S3 and S4                          

    D)  S2, S3, S4 and S5

    Correct Answer: D

    Solution :

                     (i) The optical fibres are used to transmit light signal from one place to another without any practical loss in the intensity of light signal. (ii) Optical fibre is made of a thin glass core surrounded by a glass coating. (iii) It works on the principle of total internal reflection.


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