Question

Sodium light $(\lambda =6\times {10}^{-7}m)$ is used to produce interference pattern. The observed fringe width is $0.12$ mm. The angle between two interfering wave trains, is

• A. $1\times {10}^{-3}$ rad
• B. $1\times {10}^{-2}$ rad
• C. $5\times {10}^{-3}$ rad
• D. $5\times {10}^{-2}$ rad

Answer 1

The correct option is C $5\times {10}^{-3}$ rad

The correct answer should be option c.