Hi this is my 1st subject
You can ask me for any thing any time

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:006et4:لو سمحت أنا مش عارفة أوصل لأى توقع من الاسئلة اللى فى المنتدى
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فيييييييييييييننننننننن مش موججججججججودددد

ألف شكر مع التحية

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In problems concerning Prism to know the refractive index ; some books apply the following
n=sin phi one/sin theta one= sin theta two/sin phi two

but sometimes in the answers they apply this law or use n=sin phi two/sin theta two instead of it

why?
and according to what in the problem ? given that the problem give no information to reach this method


2- Chapter 4

what is the mechanism of the U-shaped tube balance ? when we add oil to the water then the oil pushes the water and we take the separating surface .....is this correct meaning?


thanks for ur help

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