Answer
Relative frequency is given
λ=0.5m\lambda=0.5mλ=0.5m
Δλ=2nm\Delta \lambda=2nmΔλ=2nm
Frequency
ν=cλ=6×108Hz\nu=\frac{c}{\lambda}=6\times10^8Hzν=λc=6×108Hz
Now relative frequency is given
Δνν=cΔλλ2=3×108×2×10−90.5×0.5\frac{\Delta \nu}{\nu}=\frac{c\Delta \lambda}{\lambda^2}=\frac{3\times10^8\times2\times10^{-9}}{0.5\times0.5}νΔν=λ2cΔλ=0.5×0.53×108×2×10−9
=12=12=12
ΔνL=12×4×1014=48×1014Hz\Delta \nu_L=12\times4 \times 10^{14}\\=48 \times 10^{14}HzΔνL=12×4×1014=48×1014Hz
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