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JEE Main & Advanced Sample Paper JEE Main Sample Paper-6

  • question_answer
    Directions: Question No. 32 are Assertion- Reaction type. Each of these contains tow statements Statement I (Assertion), Statement II (Reason). Each of these questions also has four alternative choices, only on of which is correct. You have to select the correct choices from the codes a, b, c and d given below: 
    Statement I: Newton's rings are formed in the reflected system when the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is dark.
    Statement II: The reflection in Newton's ring cases will be from a denser to rarer medium and the two interfering rays are reflected under similar conditions.

    A)  Statement I is true; Statement B is true; Statement B is not a correct explanation for Statement I,

    B)  Statement I is true; Statement II is false.

    C)  Statement I is false; Statement II is true.

    D)  Statement I is true; Statement II is true; Statements is the correct explanation for Statement I.

    Correct Answer: D

    Solution :

    When the medium between plano-convex lens and plane glass is rarer than the medium of lens and glass, the central spot of Newton's ring is dark. The darkness of central spot is due to the phase change of n which is introduced between the rays reflected from denser to rarer and rarer to denser media.


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