Advertisements
Advertisements
प्रश्न
When unpolarized light is passed through a polarizer, its intensity ______.
पर्याय
Increases
Decreases
Remain unchanged
Depends on the orientation of the polarize
उत्तर
When unpolarized light is passed through a polarizer, its intensity decreases.
Explanation:
According to Malu’s law,
`I = I_0 cos^2 (theta)`
Here `theta` is the angle between the axes of polarizers and `I_0` is the falling intensity.
So when unpolarized light passes through a polarizer, the intensity is reduced by a factor of `1/2`. The average `cos^2 theta`, averaged over all angles `theta` is `1/2`.
`I = I_0 <<cos^2 (theta)>>_("allangles")`
= `1/2 I_0`
APPEARS IN
संबंधित प्रश्न
Choose the correct option:
Which of the following phenomenon proves that light is a transverse wave?
What is Brewster’s law? Derive the formula for Brewster angle.
Unpolarized light with intensity I0 is incident on two polaroids. The axis of the first polaroid makes on the angle of 50° with the vertical, and the axis of the second polaroid is horizontal. What is the intensity of the light after it has passed through the second polaroid?
Light entering an air glass (µ = 1.5) boundary is partly reflected and partly refracted. If the incident and reflected rays are at right angles to each other, the angle of refraction r is given by ____________.
The Brewster's angle for the glass-air interface is (54.74)°. If a ray of light passing from air to glass strickes at an angle of incidence 45°, then the angle of refraction is ______.
`[tan (54.74)° = sqrt2, sin 45 = 1/sqrt2]`
The unit of intensity of polarization is ____________.
The polarizing angle for a transparent medium is 'θ' and 'V' is the speed of light in that medium, then relation between 'θ' and 'V' is (c = velocity of light).
Choose the CORRECT statement from the following.
Brewster's angle for a transparent medium is ______.
When a beam of unpolarised monochromatic light is incident on a plane glass plate at a polarizing angle, then which one of the following statements is correct?
When unpolarised light is passed through crossed polaroids, then light passing through the first polaroid ______
The angle of polarization for a medium is 60°. The critical angle for this will be ______
`(tan 60^circ = sqrt3)`
From Brewster's law, except for polished metallic surfaces, the polarising angle ______.
Define electric polarization in dielectrics.
Unpolarized light with intensity I0 is incident on two polarizers initially oriented for maximum transmission. What is the intensity of the light transmitted through the second polarizer if the second polarizer is rotated through (a) 30° (b) 60°?
The wavelengths of a certain blue light in air and in glass are 480 nm and 320 nm, respectively. Find the Brewster angle for this blue light incident on the glass.
Unpolarized light is passed through two polarizers that are oriented with their transmission axes perpendicular. What percentage of the light intensity passed by the first polarizer is the light intensity passed by the second polarizer when the second polarizer is rotated through 30°?
Draw a neat labelled diagram of unpolarized light passing through two polarizers.
Draw a neat labelled diagram of Polarization of light.
Draw a neat labelled diagram of Polarization by reflection.
