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Arcsin width/length of a water droplet on any surface will give you the angle between the droplet trajectory before falling (assume straight line rather than parabola) and the surface upon which it fell.

As this angle approaches 90degrees (water drop falling vertically on a horizontal surface) measuring these two variables [width, length] will be more difficult as even a small error will result in a large difference in the angle calculation.

I would like to investigate mathematically this relationship, such as working on confidence intervals for angles of impact as functions of angle of impact itself etc. but I would appreciate some guidance as to how to go about it.

Thank you

Alex

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# Droplet impact angles, errors in.

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