MCQ
Two coherent plane light waves of equal amplitude makes a small angle $\alpha ( < < 1)$ with each other . They fall almost normally on a screen. If $\lambda $ is the wavelength of light waves, the fringe width $\Delta x$ of interference patterns of the two sets of waves on the screen is
- A$\frac{{2\lambda }}{\alpha }$
- B$\frac{{\lambda }}{\alpha }$
- ✓$\frac{{\lambda }}{(2\alpha )}$
- D$\frac{{\lambda }}{\sqrt \alpha }$
