Order

Definition

Order in wave optics refers to the integer value that characterizes the position of a bright or dark fringe in an interference pattern. Higher-order fringes correspond to higher integer values of this order.

5 Must Know Facts For Your Next Test

1. The order number (m) is an integer representing the sequence of bright or dark fringes.
2. In Young's Double Slit Experiment, constructive interference occurs at integer orders, where $m = 0, \pm1, \pm2,...$
3. Destructive interference happens at half-integer orders, like $m = \pm0.5, \pm1.5,...$
4. The path difference between the two waves is given by $d\sin(\theta) = m\lambda$ for constructive interference.
5. The central maximum corresponds to the zeroth order (m=0).

Review Questions

• What does the term 'order' signify in the context of an interference pattern?
• How is the order related to constructive and destructive interference?
• What is the path difference between two waves for a first-order maximum?

Related terms

Constructive Interference:

Occurs when two waves combine to form a wave with a larger amplitude; happens at integer orders.

Destructive Interference:

Occurs when two waves combine to form a wave with a smaller or zero amplitude; happens at half-integer orders.

Path Difference:

$d\sin(\theta)$ represents the difference in distance traveled by two waves from their respective slits to a common point on the screen.