Multiple choice

How much bandwidth is there in 0.2 micron of spectrum at a wavelength of 1 micron?

  1. 60,000 GHz

  2. 15,000 GHz

  3. 30,000 GHz

  4. 40,000 GHz
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A Correct answer
Explanation

Using $\Delta f$ =$\dfrac{c \Delta \lambda}{\lambda^2}$, where $\Delta \lambda$ = 2 x 10-7 And      $\lambda$ = 10-6 $\Delta f$ = 60,000 GHz

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