In a diffraction pattern due to a single slit of width a, the first minimum is observed at an angle `30^(@)` when light of wavelength 5000 Å is incident on the slit. The first secondary minimum is observed at an angle of

Options

A. `sin^-1 (1/4)`
B. `sin^-1(2/3)`
C. `sin^-1(1/2)`
D. `sin^-1(3/4)`

Answer

D