(adsbygoogle = window.adsbygoogle || []).push({}); slit diffraction in water???

Hello! I'm having trouble answer this hw problem:

Suppose the entire apparatus (light of wavelength X nm from a distant source is incident on a slit Y mm wide, and the resulting diffraction pattern is observed on a screen Z m away) is immersed in water (n=1.33).

Then what is the distance between the two dark fringes on either side of the central bright fringe?

I know what I want to use the equation for Dark fringes in single-slit diffraction:

sin(theta) = m*lamda/a

in my case, m = 1

and a = y

I'm not sure how to solve this problem now that the entire apparatus is immersed in water? I know water affects this, but how? Can you help me start this problem?

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# Homework Help: Slit diffraction in water?

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