Q. A narrow slit of width 2 mm is illuminated by monochromatic light of wavelength 500 nm. The distance between the first minima on either side on a screen at a distance of 1 m is
A) 5 mm
B) 0.5 mm
C) 1 mm
D) 10 mm
Explanation
(b) Distance $= \frac{2\lambda}{b} \times d$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{2 \times 0.5 \times 10^{- 4}}{2} \times 100 = 0.5\ mm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.