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

Answer: (C)

$9\frac{\lambda}{2}$

Answer 2

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) : $9\frac{\lambda}{2}$