Youngs Double Slit Experiment

In Young’s double slit experiment, the slits are apart and are illuminated by photons of two wavelengths and . At what minimum distance from the common central bright fringe on the screen, from the slit, will a bright fringe from one interference pattern coincide with a bright fringe from the other?
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Two slits in Young’s experiment have widths in the ratio of The ratio of intensity at the maxima and minima in the interference pattern is:

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Young’s double-slit experiment is first performed in air and then in a medium other than air. It is found that the bright fringe in the medium lies where the dark fringe lies in the air. The refractive index of the medium is nearly:
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In Young's double-slit experiment, the separation between the slits is , the wavelength of the light used is and distance between the screen and slits is . It is found that the angular width of the fringes is . To increase the fringe angular width to (with same and ) the separation between the slits needs to be changed to:
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In a double-slit experiment, when the light of wavelength was used, the angular width of the first minima formed on a screen placed away, was found to be What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water?
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In Young's double-slit experiment, a student observes fringes in a certain segment of the screen when a monochromatic light of nm wavelength is used. If the wavelength of light is changed to nm, then the number of fringes he would observe in the same region of the screen is:
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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.

1.	Statement I is False but Statement II is True.
2.	Both Statement I and Statement II are True.
3.	Both Statement I and Statement II are False.
4.	Statement I is True but Statement II is False.

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

1.	there will be a central dark fringe surrounded by a few coloured fringes.
2.	there will be a central bright white fringe surrounded by a few coloured fringes.
3.	all bright fringes will be of equal width.
4.	interference pattern will disappear.