Two straight and parallel slits 0.4 mm apart , are illuminated by a source of monochromatic light. Interfer- ence patter of fringe width 0.5 mm is produced 40 cm away from the slits . Find the wavelength of the light used.

Two straight and narrow parallel slits 0.3 mm apart are illuminated by monochromatic light of wavelength 5900 Å .Find the width of fringe due to interference at a distance of 0.6 m from the slits.

Two parallel slits 0.6mm apart are illuminated by light source of wavelength 6000Å . The distance between two consecutive dark fringe on a screen 1m away from the slits is

Two straight and narrow parallel slits separated by 3mm are illuminated by a monochromatic light of wavelength 5460 overset (@)(A) . Interference fringes are obtained at a distance of 60 cm from the slits. Find the change in fringe width if the distance between the slits is i) increased by 1 mm and ii) decreased by 1mm.

In Young's experiment if two straight narrow parallel slits 3 mm apart are illuminated with monochromatic light of wavelength 5900 xx 10^(-8) cm (centimetre). Fringes are observed at a distance of 3m from slits. Find the width of fringes.

In Young's double slit experiment the slits apart by 3 mm are illuminated with a source of monochromatic light of wavelength 6000 Å. Interference fringes are obtained on a screen at a distance of 1 m from the slits . The width of the fringe will be

Two straight narrow parallel slis 0.2 mm apart are illuminated byp monochromatic light of wavelength 6000 overset(@)(A) . Find the width of the fringe due to interference at a distance of 10 cm.

In a Young's double experiment , the slits are 1.5 mm apart. When the slits are illuminated by a nonochromatic light source and the screen is kept 1 m apart from the slits ,width of 10 fringes is measured as 3.93 mm . Calculated the wavelength of light used. What will be the width of 10 fringes when the distance between the slits and the screen is increased by 0.5 m . The source of light used remains the same.