An electron beam is incident on a crystal. The interplanar spacing of the crystal is $b$. Which of the following de Broglie wavelengths of the electron beam will result in direct reflection?
- A$\lambda = \frac{2b}{n}$
- B$\lambda = \frac{b}{n}$
- C$\lambda = \frac{3b}{n}$
- D$\lambda = \frac{4b}{n}$
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