Advertisements
Advertisements
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.
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.
APPEARS IN
संबंधित प्रश्न
If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................
What is a Polaroid?
For a glass plate as a polariser with refractive index 1.633, calculate the angle of incidence at which light is polarised.
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
Show, via a suitable diagram, how unpolarised light can be polarised by reflection.
The refractive indices of water for red and violet colours are 1.325 and 1.334 respectively.
Find the difference between the velocities of rays for these two colours in water. (c = 3 × 108 m/s)
With the help of an experiment, state how will you identify whether a given beam of light is polarised or unpolarized?
The transverse nature of light is shown in ______.
Discuss polarisation by selective absorption.
What is a polariser?
What is a analyser?
What is plane polarised light?
List the uses of polaroids.
What is the angle of polarisation and obtain the equation for an angle of polarisation?
How is polarisation of light obtained by scattering of light?
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.