JEE Main 202621 Jan, Morning shiftPhysicsMediumOptics190× since 2002
In a double slit experiment the distance between the slits is 0.1 cm and the screen is placed at 50 cm from the slits plane. When one slit is covered with a transparent sheet having thickness t and refractive index , the central fringe shifts by 0.2 cm. The value of t is ______ cm.