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प्रश्न
List the uses of polaroids.
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उत्तर
- Polaroids are used in goggles and cameras to avoid glare of light.
- Polaroids are useful in three dimensional motion pictures i.e., in holography.
- Polaroids are used to improve contrast in old oil paintings.
- Polaroids are used in optical stress analysis.
- Polaroids are used as window glasses to control the intensity of incoming light.
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संबंधित प्रश्न
With the help of neat diagram, explain how non-polar dielectric material is polarised in external electric field of increasing intensity. Define polarisation in dielectrics.
What dose a polaroid consist of?
Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.
Unpolarised light is passed through a polaroid P1. When this polarised beam passes through another polaroid P2 and if the pass axis of P2 makes angle θ with the pass axis of P1, then write the expression for the polarised beam passing through P2. Draw a plot showing the variation of intensity when θ varies from 0 to 2π.
What is the value of refractive index of a medium of polarising angle 60°?
The glass plate of refractive index 1.732 is to be used as a polarizer, its polarising angle is _______.
With the help of an experiment, state how will you identify whether a given beam of light is polarised or unpolarized?
State any two methods by which ordinary light can be polarised
What does a polaroid consist of? How does it produce a linearly polarised light?
Explain how an unpolarised light gets polarised when incident on the interface separating the two transparent media.
What is polarisation?
What is a polariser?
State and obtain Malus’ law.
What is the angle of polarisation and obtain the equation for an angle of polarisation?
Discuss about Nicol prism.
Which of the following phenomena is not common to sound and light waves?
Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in figure. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.
For the same objective, find the ratio of the least separation between two points to be distinguished by a microscope for light of 5000 Å and electrons accelerated through 100 V used as the illuminating substance.
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at 22.5° from the polarization axis of one of the polaroids, is (I0 is the intensity or polarised light after passing through the first polaroid):
