SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    Total internal reflection, of light can occur only when light passes:

    A)  From denser to a rarer medium

    B)  From rarer to a denser medium

    C)  From one medium to another of equal refractive index

    D)  From one medium to another of equal absorption coefficient

    Correct Answer: A

    Solution :

    [a] When light travels from one medium to another it changes speed and is refracted. If the light rays are travelling for a less dense material to a dense medium they are refracted towards the normal and if they are travelling from a dense to less dense medium they are refracted away from the normal. For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air).

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