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  4. Two coherent light sources each of wavelength λ are separated by a distance 3 λ. The maximum number of minima formed on line A B which runs from -∞ to +∞ is

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Q. Two coherent light sources each of wavelength $\lambda$ are separated by a distance $3 \lambda$. The maximum number of minima formed on line $A B$ which runs from $-\infty$ to $+\infty$ isPhysics Question Image

Wave Optics

Solution:

There can be three minima from central point to $\infty$ corresponding to $\frac{\lambda}{2}, \frac{3 \lambda}{2}, \frac{5 \lambda}{2}$ path differences.
$\therefore $ total number of minima $=2 n_{\max }=6$.