The slits in a double-slit interference experiment are illuminated by orange light `(lambda = 60 nm)`. A thin transparent plastic of thickness t is placed in front of one of the slits. The nunber of fringes shifting on screen is plotted versus the refractive index `mu` of the plastic in graph shown in figure. The value of t is

A thin transparent sheet is placed in front of a slit in Young's double slit experiment. The fringe width will

In Young's experiment, if a slab of mica of refractive index mu and thickness of t is introduced in the path of light from one of the slits, then number of fringes formed on the screen will –

A two slit Young's interference experiment it done with monochromatic light of wavelength 6000 A . The slits are 2 mm apart. The fringes are observed on a screen placed 10 cm away from the slits. Now a transparent plate of thickness 0.5 mm is placed in front of one of the slits and it if found that the interference pattern shifts by 5 mm . The refractive index of the transparent plate is :

Interference fringes were produced in Young's double-slit experiment using light of wavelength 5000 Å . When a film of thickness 2.5xx10^(-3) cm was placed in front of one of the slits, the fringe pattern shifted by a distance equal to 20 fringe-widths. The refractive index of the material of the film is

Interference fringes were produced in Young's double-slit experiment using light of wavelength 5000 Å . When a film of thickness 2.5xx10^(-3) cm was placed in front of one of the slits, the fringe pattern shifted by a distance equal to 20 fringe-widths. The refractive index of the material of the film is

A double slit experiment is done with monochromatic light of wavelength 6000 Å . Slits are 2 mm apart and fringes are observed on a screen placed 10 cm away from the slits. If a transparent plate of thickness 0.5 mm is placed in front of one of the slit, interference pattern shifts by 5 mm. Then refractive index of transparent plate should be :

Young's double slit experiment is conducted in a liquid of refractive index mu_1 as shown in figure. A thin transparent slab of refractive index mu_2 is placed in front of the slit s_2 . The magnitude of optical path difference at 'O' is

Young's double slit experiment is conducted in a liquid of refractive index mu_1 as shown in figure. A thin transparent slab of refractive index mu_2 is placed in front of the slit s_2 . The magnitude of optical path difference at 'O' is

In a Young's double slit experiment let A and B be the two slits. A thin plate of thickness t and refractive index mu is placed in front of A. Let beta be the fringe width. The central maximum will shift