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प्रश्न
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.
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उत्तर
Weak radar signals sent by a low flying aircraft can interfere with the TV signals received by the antenna. As a result, the TV signals may get distorted. Hence, when a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen.
संबंधित प्रश्न
What is a Polaroid?
If the critical angle of a medium is sin-1(3/5), find the polarising angle.
What dose a polaroid consist of?
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How does one demonstrate, using a suitable diagram, that unpolarised light when passed through a Polaroid gets polarised?
Show, with the help of a diagram, how unpolarised sunlight gets polarised due to scattering.
Using the phenomenon of polarisation, show how the transverse nature of light can be demonstrated.
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State two uses of Polaroid.
Green light is incident at the polarising angle on a certain transparent medium. The angle of refraction is 30° . Find
(i) polarising angle, and
(ii) refractive index of the medium.
A ray of ordinary light is travelling in air. It is incident on air glass pair at a polarising angle of 56°. Find the angle of refraction in glass.
State Brewster’s law.
How is polarisation of light obtained by scattering of light?
Polarisation of light is the only phenomenon that establishes ______.
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.
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.
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is ______.
