RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    When a ray of light enters into water from air, then its wavelength :

    A)  decreases         

    B)         increases           

    C)         remains same  

    D)         none of these

    Correct Answer: A

    Solution :

    Wavelength \[\lambda =\frac{\upsilon }{n}\] When a light ray enters into water from air, the frequency (n) is unchanged but velocity (v) decreases. \[\therefore \] \[\lambda \] decrease.


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