MCQ
Two coherent light source $A$ and $B$ are at a distance $3\, \lambda$ from each other $(\lambda =$ wavelength). The distances from $A$ on the $x$ -axis at which the interference is constructive are
- A$3 \lambda$
- ✓$4 \lambda$
- C$\lambda / 4$
- D$8.75 \lambda$
