The first diffraction minima due to a single slit diffraction is at `theta ` = 30o for a light of wavelength 5000 `dotA` . The width of the slit is
5 `xx` 10-5 cm
2.5 `xx` 10-5 cm
1.0 `xx` 10-5 cm
1.25 `xx` 10-5 cm
what is slit