(B) The given wavelength is $\lambda = 0.00006\,m = 6 \times 10^{-5}\,m$.We know that $1\,micron = 1\,\mu m = 10^{-6}\,m$.To convert the wavelength in

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(B) The given wavelength is $\lambda = 0.00006\,m = 6 \times 10^{-5}\,m$.We know that $1\,micron = 1\,\mu m = 10^{-6}\,m$.To convert the wavelength into microns,we divide by $10^{-6}\,m$:$\lambda = \frac{6 \times 10^{-5}\,m}{10^{-6}\,m/micron} = 6 \times 10^{1}\,microns = 60\,microns$.Therefore,the correct option is $B$.