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

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

Light appears to travel in a straight line because

Two sodium lamps are used in an interference experiment. The intensity produced by both lamps individually on the screen is I. The ratio of intensity of maxima to intensity of minima on the screen is

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

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

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

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

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