Q1- Light of wavelength 589 nm from a sodium lamp illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm. What is the spacing between the two slits?
Q2- A double-slit experiment is performed with light of wavelength 600 nm. The bright interference fringes are spaced 1.8 mm apart on the viewing screen. What will the fringe spacing be if the light is changed to that of a wavelength of 800 nm?
Q3- In a single-slit experiment the slit width is 200 times the wavelength of the light used. What is the width of the central maximum on a screen 2.0 m behind the slit?
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