MCQ
Two coherent narrow slits emitting light of wavelength $\lambda$ in the same phase are placed parallel to each other at a small separation of $3\lambda$ . The light is collected on a screen $S$ which is placed at a distance $D ( > > \lambda )$ from the slits. The smallest distance $x$ such that the $P$ is a maxima
- A$\sqrt {3}D $
- B$\sqrt {8}D $
- C$\sqrt {5}D $
- ✓$\sqrt 5 \,\frac{D}{2}$
