SH 402 · Chapter 4
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What are constructive and destructive interference? Prove that the path difference for constructive interference is integer multiple of $\lambda$ and that for destructive interference is odd integer multiple of $\displaystyle \frac{\lambda}{2}$.
Two coherent sources having constant phase $\delta$ but different amplitudes $A_{1}$ and $A_{2}$ superimpose, prove that the intensity of superimposed beam is $I = {A}_{1}^{2} + {A}_{2}^{2} + 2{A}_{1}{A}_{2} \cos \delta$ .
Light of wavelength $6000\,\mathrm{A}$ falls normally on a thin wedge shaped film of refractive index 1.4, forming fringes that are $2\,\mathrm{mm}$ apart. Find the angle of the wedge.