Question

In a Young' double slit experiment. if there is no initial phase difference between the light from the two slits, a point on the screen corresponding to the fifth minimum has path difference.

• A. $5\frac{\lambda}{2}$
• B. $10\frac{\lambda}{2}$
• C. $9\frac{\lambda}{2}$
• D. $11\frac{\lambda}{2}$

Answer 1

The Correct Option is C

Path difference for \(n^{th}\) minima \(=(2n - 1) \frac{\lambda}{2}\) 
For fifth minima \((n = 5) = \frac{9\lambda}{2}\)
Therefore, the correct option is (C) : \(9\frac{\lambda}{2}\)