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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2006

  • question_answer
    In Youngs experiment, using red light \[(\lambda =6600\overset{\text{o}}{\mathop{\text{A}}}\,),\] 60 fringes are seen in the field of view. How many fringes will be seen by using violet light \[(\lambda =4400\overset{\text{o}}{\mathop{\text{A}}}\,)\] ?

    A)  10                                         

    B)  20

    C)  45                         

    D)         90

    E)  35

    Correct Answer: D

    Solution :

    Using red light\[(\lambda =6600{\AA})\]60 fringes are seen. Hence, range of field of view is \[60\times w=60\times \frac{D\lambda }{d}\] using light of wavelength\[\lambda ,n\]fringes are seen, then \[\Rightarrow \]               \[60\times \frac{D\lambda }{d}=n\times \frac{D\lambda }{d}\] \[60\times \lambda =n\times \lambda \] \[\Rightarrow \]               \[n=60\times \frac{\lambda }{\lambda }=60\times \frac{6600}{4400}=90\]


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