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## Homework Statement

This is not a homework question but I would like if someone could explain to me when to consider what equation constructive/destructive? I learned these two equations very vaguely in class:

dsinθ = mλ or d(y

_{m})/L=mλ

dsinθ = (m+1/2)λ or d(y

_{m})/L = (m+1/2)λ

The power point provided for us in class says that dsinθ=mλ is constructive and the other eqn is destructive. However when we started discussing thin film interference, suddenly the equations turned to

2t = mλ

2t= (m+1/2λ)

and in some situations 2t = mλ an equation for destructive interference and vice versa. When do I also know which equation to use for specific situations?

## Homework Equations

dsinθ = mλ or d(y

_{m})/L=mλ

dsinθ = (m+1/2)λ or d(y

_{m})/L = (m+1/2)λ

2t = mλ

2t= (m+1/2λ)