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

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 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

λ_a and λ_m are the wavelengths of a beam of light in air and in a medium respectively. If θ is the polarising angle, the correct relation between λ_a , λ_{m and θ is}

Light appears to travel in a straight line because

The velocity of light in diamond, glass and water decreases in the following order:

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

The Young's double slit experiment is performed with blue and with green light of wavelengths 4360 Å and 5460 Å respectively. If x is the distance of the 4th maxima from the central one, then

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

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