I had figure it out.displacement is directly related to sin kx.displacement is Zero when kx equal to n*pai
where n is integer.displacement always zero when x = n*pai/k.
Homework Statement
given 2 waves y1=Ysin(kx-wt): y2=Ysin(kx+wt).
derive expression of resultant displacement and expression of x(for resultant) where displacement always zero
Homework Equations
y=y1+y2
sinA+sinB=2sin((A+B)/2)cos((A-B)/2)
The Attempt at a Solution
i solved first...
thanks.now i know how to solve it. is it Δlambda/Δθ= d/m cosθ? and by using small angle approximation,cos theta = 1.so Δθ= Δlambda*m/d? i forgot to put extra info:d=(1/600)mm
1. using differentiation,find the angular separation in arc minutes in second order for two wavelengths 589.0 and 589.6 nanometers
2. d sin(\theta)=m (\lambda)
3. i try to use D=\delta\theta/\delta\lambda
by differentating d sin(\theta)=m (\lambda) i got d/m sec(thetha).this...