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## Homework Statement

A triple-slit experiment consists of three narrow slits, equally spaced by distance d and illuminated by light of wavelength λ. Each slit alone produces intensity I1 on the viewing screen at distance L.

Consider a point on the distant viewing screen such that the path-length difference between any two adjacent slits is λ.

What is the intensity at this point?

Express your answer in terms of I1

What is the intensity at a point where the path-length difference between any two adjacent slits is λ/2?

Express your answer in terms of I1.

## Homework Equations

I have no idea what applies to this.

## The Attempt at a Solution

I have no idea how to solve this. I know that the answers are 9I for the first question and I for the second. I found it in a list of problems to know for my final exam, but i have no clue how to start.