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**1. Homework Statement**

Laser light of wavelength λ is incident onto a pair of narrow slits of width a and spacing d

Write down an expression for the intensity as a function of angle of the angle measured from the central axis, θ, in the far-*‐field

**2. Homework Equations**

**3. The Attempt at a Solution**

I thought it was just the product of single and double slit diffraction, i.e....

I= I

_{0}cos

^{2}(∏dsinθ/λ)(sin(∏asinθ/λ)/∏asinθ/λ))

^{2}

but the answer was I=

**4**I

_{0}cos

^{2}(∏dsinθ/λ)(sin(∏asinθ/λ)/∏asinθ/λ))

^{2}

im not sure where this 4 has come from??

also how would I show if d=a then this formula turns into the double slit pattern.??

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