Advertisements
Advertisements
प्रश्न
With the help of an experiment, state how will you identify whether a given beam of light is polarised or unpolarized?
उत्तर
Detection of plane polarised light: Naked eyes or the polarizer alone cannot make the distinction between unpolarised light and plane polarised light. To analyse the nature of light, another crystal (analyser) is used. The tourmaline crystal is used to produce plane polarised light.
If the polarizers rotated in the path of the ordinary light, the intensity of the light transmitted from the polarizer remains unchanged. It is because, in each orientation of the polarizer, the plane polarised light is obtained, which has vibrations in a direction parallel to the axis of the crystal in that orientation. If the analyser is rotated in the path of the light transmitted from the polarizer,so that the axis of the polarizer and the analyser are parallel to each other, then the intensity of light is found to remain unaffected [see figure].
If the axis of the polarizer and the analyser are perpendicular to each other as shown in the figure, then the intensity of light becomes minimum
In this position, the polarizer and the analyser are said to be in crossed position.
APPEARS IN
संबंधित प्रश्न
What dose a polaroid consist of?
Show, using a simple polaroid, that light waves are transverse in nature. Intensity of light coming out of a polaroid does not change irrespective of the orientation of the pass axis of the polaroid. Explain why.
Two polaroids P1 and P2 are placed with their pass axes perpendicular to each other. An unpolarised light of intensity I0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle of 30° with that of P1. Determine the intensity of light transmitted through P1, P2 and P3
A beam of light is incident at the polarizing angle of 35° on a certain glass plate. The refractive index of the glass plate is :
Light transmitted by Nicol prism is ______.
What is partially polarised light?
Discuss about Nicol prism.
Polarisation of light is the only phenomenon that establishes ______.
Figure shown a two slit arrangement with a source which emits unpolarised light. P is a polariser with axis whose direction is not given. If I0 is the intensity of the principal maxima when no polariser is present, calculate in the present case, the intensity of the principal maxima as well as of the first minima.
An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30° in clockwise direction, the intensity of emerging light will be ______ Lumens.
