Figure shows a YDSE setup having identical slits `S_(1)` and `S_(2)` with d =5 mm and D = 1 m. A monochromatic light of wavelength `lamda = 6000 Å` is incident on the plane of slit due to which at screen centre O, an intensity `I_(0)` is produced with fringe pattern on both sides Now a thin transparent film of `11 mu m` thickness and refractive index `mu = 2.1` is placed in front of slit `S_(1)` and now interference patten is observed again on screen.

After placing the film of slit `S_(1)`, the intensity at point O screen is :

Figure shows a YDSE setup having identical slits S_(1) and S_(2) with d =5 mm and D = 1 m. A monochromatic light of wavelength lamda = 6000 Å is incident on the plane of slit due to which at screen centre O, an intensity I_(0) is produced with fringe pattern on both sides Now a thin transparent film of 11 mu m thickness and refractive index mu = 2.1 is placed in front of slit S_(1) and now interference patten is observed again on screen. Due to placement of film in front of S_(1) , how many bright fringes cross the point O of screen excluding the one which was at O earlier :

In YDSE monochromatic light of wavelength 600 nm incident of slits as shown in figure. If S_(1)S_(2) = 3mm, OP=11 mm then

A monochromatic light of lambda = 500 Å is incident on two indentical slits separated by a distance of 5 xx 10^(-4) m. The interference pattern is seen on a screen placed at a distance of 1 m from the plane of slits. A thin glass plate of thickness 1.5 xx 10^(-6) m and refractive index mu = 1.5 is placed between one of the slits and the screen . Find the intensity at the center of the screen.

Light of wavelength 6000Å is incident on a slit of width 0.30 mm. The screen is placed 2 m from the slit. Find (a) the position of the first dark fringe and (b). The width of the central bright fringe.

In YDSE , slab of thickness t and refractive index mu is placed in front of any slit. Then displacement of central maximu is terms of fringe width when light of wavelength lamda is incident on system is

In Young’s experiment, monochromatic light through a single slit S is used to illuminate the two slits S_1 and S_2 . Interference fringes are obtained on a screen. The fringe width is found to be w. Now a thin sheet of mica (thickness t and refractive index mu ) is placed near and in front of one of the two slits. Now the fringe width is found to be w’, then :

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 :

Monochromatic light of lamba=5000Å is incident on two slits separately by a distance of 5xx10^(-4)m . The interference patteren is seen on a screen placed at a distance of 1m form the slits. A thing glass plate of thicknes 1.5xx10^(-6)m and refractive index mu=1.5 is placed between one of the slits and the screen. Find the intensity at the centre of the screen if the density there is I_(0) in the absence of the plate. Also find the lateral shift of the central maximum. '

Two slits in YDSE are placed 1 mm from each other. Interference pattern is observed on a screen placed 1m from the plane of slits. What is the angular fringe width for a light of wavelength 400 nm