11Nishant bhai?
2 coherent point light sources are placed at x=\pm \frac{d}{2} . These sources are surrounded by a spherical screen having eqn x^2+y^2+z^2=R^2.
Given R>>d, sources emit monochromatic light of wavelength \lambda=\frac{d}{3}.
Waves from both the sources reach the screen and superimpose.
Q- Since the screen is a bounded one, the length of maxima is finite - so find length of 2nd order maxima along with its shape.
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