Interference and Young's double-slit experiment

If the monochromatic source in Young's double slit experiment is replaced by white light, then

For Young's double slit experiment, two statements are given below:

Statement I : If screen is moved away from the plane of slits, angular separation of the fringes remains constant.

Statement II : If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

In the light of the above statements, choose the correct answer from the options given below:

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is :

In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be \(0.2^\circ\). What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water ? (\(\mu_{water} = 4/3\))

In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength \(\lambda\) of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is \(0.20^\circ\). To increase the fringe angular width to \(0.21^\circ\) (with same \(\lambda\) and D) the separation between the slits needs to be changed to

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that \(8^{th}\) bright fringe in the medium lies where \(5^{th}\) dark fringe lies in air. The refractive index of the medium is nearly :

The intensity at the maximum in a Young's double slit experiment is \(I_0\). Distance between two slits is \(d = 5\lambda\), where \(\lambda\) is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance \(D = 10\,d\) ?

The interference pattern is obtained with two coherent light sources of intensity ratio \(n\). In the interference pattern, the ratio \(\frac{I_{max}-I_{min}}{I_{max}+I_{min}}\) will be