When an unpolarised light passes through …

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What is unpolarized light-a light which travels in random directions in electric and magnetic waves...but the question is how it's get polarised...so your answer will vary according to the polarizer beacuse each polarizer polarize the lights in different way and there r 3 ways-One way to polarize light is by reflection. Light reflecting off a surface will tend to be polarized, with the direction of polarization (the way the electric field vectors point) being parallel to the plane of the interface. Another way to polarize light is by selectively absorbing light with electric field vectors pointing in a particular direction. Certain materials, known as dichroic materials, do this, absorbing light polarized one way but not absorbing light polarized perpendicular to that direction. If the material is thick enough to absorb all the light polarized in one direction, the light emerging from the material will be linearly polarized. Polarizers (such as the lenses of polarizing sunglasses) are made from this kind of material. A third way to polarize light is by scattering. Light scattering off atoms and molecules in the atmosphere is unpolarized if the light keeps traveling in the same direction, is linearly polarized if at scatters in a direction perpendicular to the way it was traveling, and somewhere between linearly polarized and unpolarized if it scatters of at another angle. There can be more ways but these r main ways... Hope you understands that Any related queries pls ask Thank u(#Alternate)

It is due to use of palaroid. A Polaroid consists of micro crystals of herapathite (an iodosulphate of quinine). Each crystal is a doubly refracting medium, which absorbs the ordinary ray and transmits only the extra ordinary ray. Thus, allowing only one dimensional light.i.e plane polarised light