Q. Monochromatic green light of wavelength $5 \times 10^{- 7}m$ illuminates a pair of slits $1\ mm$ apart. The separation of bright lines on the interference pattern formed on a screen $2\ m$ away is
A) $0.25\ mm$
B) $0.1\ mm$
C) $1.0\ mm$
D) $0.01\ mm$
Explanation
(c) $\beta = \frac{\lambda D}{d} = \frac{5 \times 10^{- 7} \times 2}{10^{- 3}}m = 10^{- 3}m = 1.0\ mm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.