question_answer 7)

In a double-slit experiment, the angular widthof a fringe is found to be 0.2° on a screenplaced 1 m away. The wavelength of light usedis 600 nm. What will be the angular width ofthe fringe if the entire experiment apparatusis immersed in water ? Take refractive indexof water to be  

Answer:

Angular width,                         ?.(i) When apparatus is immersed in water, wavelength Angular width, .