Q. In Young’s double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is
A) $\sin^{- 1}{0.01}$
B) $\sin^{- 1}{0.0001}$
C) $\sin^{- 1}{0.001}$
D) $\sin^{- 1}{0.1}$
Explanation
(c) $\sin{\theta = \frac{\lambda}{d}}$
$= \frac{589 \times 10^{- 9}}{0.589 \times 10^{- 3}} = 10^{- 3} = \frac{1}{1000} = 0.001$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.