A) expands
B) contracts
C) remains same
D) first expands then contracts
Correct Answer: B
Solution :
The diameter of nth dark ring is given by \[\mu d_{n}^{2}=4nR\lambda \] When drop of water is introduced between the glass plate and convex lens the value of \[\mu \] and \[{{d}_{n}}\] decreases. Therefore, as a result the ring system will contract.
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