Question about Young's double slit equation

[bonbon22]

Homework Statement

What is the relationship between youngs double slit equation w=lambda * D /s and
n lamda= dsin(theta) could i use both equations and arrive at the same answer for wavelength for example in a double slit experiment? Also how did young derive the double slit equation ?

Relevant Equations

w=lambda * D /s and
n lamda= dsin(theta)

im assuming the double slit can also be used in the diffraction grating equation. Would the number of lines per meter aka the d value be 1/2 for example in this case also? If both were in one meter.

 

[Charles Link]

Suggest you google the topic, and try to make your question a little more clear. I don't think the first equation that you have is commonly used in the form you show it. You didn't define what the various letters represent, and the letters you are using are not customary ones.

 

[CWatters]

Make a drawing. It's all in the geometry.