A beam of monochromatic light is shone at a pair of slits. On a screen far away, interference fringes spaced $2.0\,\text{mm}$ apart are seen. The frequency of the light is then doubled, and the separation of the slits is reduced to half. What is the spacing between the new interference fringes?
- A$0.50\,\text{mm}$
- B$2.0\,\text{mm}$
- C$4.0\,\text{mm}$
- D$8.0\,\text{mm}$