Two coherent light sources S₁ and S₂ (λ = 6000 Å) are 1 mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be

In Young's experiment, the ratio of maximum and minimum intensities in the fringe system is 9:1. The ratio of amplitudes of coherent sources is

In Young's double slit experiment using red and blue lights of wavelengths 600 nm and 480 nm respectively, the value of n for which the nth red fringe coincides with (n + 1)th blue fringe is

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double slit experiment, is

In a certain double slit experimental arrangement, interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another of wavelength 6000 Å, the fringe width will be

Two points separated by a distance of 0.1 mm can just be inspected in a microscope when light of wavelength 6000 Å is used. If the light of wavelength 4800 Å is used, this limit of resolution will become

Which of the following phenomenon is not common to sound and light waves?

Air has a refractive index 1.0003. The thickness of air column, which will have one more wavelength of yellow light (6000 Å) than in the same thickness in vacuum is

In a Young's double slit experiment the intensity at a point where the path difference is λ/6 (λ being the wavelength of the light used) is I. If I₀ denotes the maximum intensity. I/I₀ is equal to 

A beam of ordinary unpolarised light passes through a tourmaline crystal C₁ and then it passes through another tourmaline crystal C₂ which is oriented such that its principle plane is parallel to that of C₂. The intensity of emergent light is I₀. Now, C₂ is rotated by 60^o about the ray. The emergent ray will have an intensity