Wavelengths of light used in an optical instrument are $\lambda_1 = 4000 \ Å$ and $\lambda_2 = 5000 \ Å$. The ratio of their respective resolving powers (corresponding to $\lambda_1$ and $\lambda_2$) is:

  • A
    $3: 5$
  • B
    $9: 1$
  • C
    $4: 5$
  • D
    $5: 4$

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