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

Question

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 (A) 2 (B) 4 (C) 6 (D) 8

Tardigrade Admin · Accepted Answer

There can be three minima from central point to ∞ corresponding to (λ/2), (3 λ/2), (5 λ/2) path differences. ∴ total number of minima =2 n max =6.

Q. 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 $- \infty$ to $+ \infty$ is

2

4

6

8

There can be three minima from central point to $\infty$ corresponding to $\frac{λ}{2}, \frac{3 λ}{2}, \frac{5 λ}{2}$ path differences.
$∴$ total number of minima $= 2 n_{m a x} = 6$ .

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

2

4

6

8

There can be three minima from central point to ∞ corresponding to 2λ​,23λ​,25λ​ path differences. ∴ total number of minima =2nmax​=6.

Q. 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 $- \infty$ to $+ \infty$ is

There can be three minima from central point to $\infty$ corresponding to $\frac{λ}{2}, \frac{3 λ}{2}, \frac{5 λ}{2}$ path differences.
$∴$ total number of minima $= 2 n_{m a x} = 6$ .