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The longest wavelength that can be absorbed by silicon, which has the bandgap of $1.12 \; \mathrm{eV}$, is $1$. If the longest wavelength that can be absorbed by another material is $0.87 \; \mu \mathrm{m}$, then the bandgap of this material is

  1. $1.416 \; \mathrm{eV}$
  2. $0.886 \: \mathrm{eV}$
  3. $0.854 \: \mathrm{eV}$
  4. $0.706 \: \mathrm{eV}$
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