The Total solution for NCERT class 6-12
In a double-slit experiment theangular width of a fringe is found to be 0.2° on a screen placed 1 m away. Thewavelength of light used is 600 nm. What will be the angular width of thefringe if the entire experimental apparatus is immersed in water? Takerefractive index of water to be 4/3.
Distance of the screen from theslits, D = 1 m
Angular width of the fringe inwater =
Refractive index is related toangular width as:
Therefore, the angular width ofthe fringe in water will reduce to 0.15°.