A laser emits light of wavelength 632.8nm. When this value is expressed in metres in scientific notation, and its order of magnitude is stated, which one of the following pairs is correct?
a) 6.328×10−7m;−7
b) 6.328×10−7m;−6
c) 0.6328×10−6m;−6
d) 6.328×10−8m;−8