Wavelength whose secondary maximum coincides with another order of a given wavelength in single slit diffraction

1. A.
   4180 Å
2. B.
   4425 Å
3. C.
   5330 Å
4. D.
   6235 Å

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1. A.
   $4242\text{Å}$
2. B.
   $4560\text{Å}$
3. C.
   $5474\text{Å}$
4. D.
   $6384\text{Å}$

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1. A.
   $\frac{5\lambda}{7}$
2. B.
   $\frac{7\lambda}{9}$
3. C.
   $\frac{3\lambda}{4}$
4. D.
   $\frac{9\lambda}{13}$

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