A student carries out an experiment on double-slit interference. To illuminate a double slit, the student uses laser light with a single wavelength, and an interference fringe pattern is seen on the screen. The student observes that the fringes are very closely spaced. What could the student reduce to make the fringes farther apart on the screen?
- Athe distance $p$ from the laser to the double slit
- Bthe distance $q$ from the double slit to the screen
- Cthe separation $r$ of the slits
- Dthe wavelength of the light from the laser