In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength $\lambda=500 \mathrm{~nm}$ is incident on the slits. The total number of bright fringes that are observed in the angular range $-30^{\circ} \leq \theta \leq 30^{\circ}$ is
Select the correct option:
A
640
B
320
C
321
D
641
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$$
\mathrm{N}=\frac{\mathrm{d} \sin \theta}{\lambda}=\frac{0.320 \times 10^{-3}}{500 \times 10^{-9}} \times \frac{1}{2}
$$
Number of Bright fringes $=2 \times 320+1=641$
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