Q. A parallel beam of light of wavelength $\ 6000\mathring{\mathrm{A}}$ gets diffracted by a single silt of width 0.3 mm. The angular position of the first minima of diffracted light is
A) $6 \times 10^{- 3}\ rad$
B) $1.8 \times 10^{- 3}\ rad$
C) $3 \times 10^{- 3}\ rad$
D) $2 \times 10^{- 3}\ rad$
Explanation
(d) $d\sin\theta = n\lambda$
$0.3 \times 10^{- 3} \times \theta = 6000 \times 10^{- 10}$
$\theta = 2 \times 10^{- 3}\ rad$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.