A double-slit interference pattern produced with red light of wavelength $7.0 \times 10^{-7}\,\text{m}$ gives a fringe spacing of $3.5\,\text{mm}$. For the same arrangement of apparatus, what fringe spacing would be seen if blue light with wavelength $4.5 \times 10^{-7}\,\text{m}$ is used instead?
- A$2.3\,\text{mm}$
- B$3.5\,\text{mm}$
- C$5.4\,\text{mm}$
- D$9.0\,\text{mm}$