JEE Advanced Model Paper 7 with solutions for online practice

Two coherent point light sources of same frequency are placed at x = -d/2 and x = d/2. These source are surrounded by a spherical screen having equation x2+y2+z2 = R2 (where R ≫ d) . The sources emit monochromatic light of wavelength (λ =d/3). Waves from both the sources reach screen and superimpose. When waves reaching any point on the screen have a constant path difference of nλ (where λ is wavelength of light and ‘n’ is some integer), the superposition of these waves is constructivein nature (i.e. maximum intensity) n may be called as order of maximum.