A slit of width a is illuminated by white light. The first minimum for red light will fall at 30^o, when a is

If a star is moving towards earth,then the lines are shifted towards

A thin transparent sheet is introduced in front of a Young's double slit experiment. The fringe width will

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

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}

Diamond has maximum refractive index, hence, velocity of light in diamond is the least. The refractive index of water is the least, hence, in water the velocity of light is maximum.

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

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

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

The resolution limit of the eye is 1. At a distance of x km from the eye, two persons stand with a lateral separation of 3 metres. For the two persons to be just resolved by the naked eye, x should be