MCQ
In a diffraction pattern due to a single slit of width $a$, the first minimum is observed at an angle $30^o $ when light of wavelength $5000 \;\mathring A$ is incident on the slit. The first secondary maximum is observed at an angle of
- A$sin^{-1}$ $\left( {\frac{2}{3}} \right)$
- B$sin^{-1}$$\left( {\frac{1}{2}} \right)$
- ✓$sin^{-1}$$\left( {\frac{3}{4}} \right)$
- D$sin^{-1}$$\left( {\frac{1}{4}} \right)$
