Question

Two coherent monochromatic point sources $S_{1}and{S}_2$ of wavelength $\lambda =600nm$ are placed symmetrically on the center of the circle as shown. The sources are separated by a distance $d=1.8mm$. This arrangement produced interference fringes visible as alternate bright and dark spot on the circumference of the circle. The angular separation between two consecutive bright spots is $△\theta$ which of the following option is are correct.

• A. A dark spot will be formed at the point $P_2$
• B. The angular separation between two consecutive bright spot decreases as we move from $P_{1}to{P}_2$ along the first quadrant
• C. at $P_2$ the order of the fringe will be maximum
• D. The total number of fringes produced between $P_{1}to{P}_2$ in the first quadrant is close to $3000$.

Answer 1

Answer: (C), (D)

The correct options are
C at $P_2$ the order of the fringe will be maximum
D The total number of fringes produced between $P_{1}to{P}_2$ in the first quadrant is close to $3000$.