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Q.

A double slit arrangement produces interference fringes for sodium light (λ=589nm) that have an angular separation of 3.50×10−3 radian.  For what wavelength would the angular separation be 10% greater?

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a

527 nm

b

648 nm

c

722 nm

d

449 nm

answer is B.

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Detailed Solution

Angular separation  =λdFor angular separation to be 10% greater λ should be 10% greater.New wavelength is 589+58910nmor (589 + 58.9) nm, i.e., 647.9 nm, i.e., 648 nm.
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