Tag: polarisation of light

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Questions Related to polarisation of light

Multiple choice polarisation of light polarisation wave optics optics physics

In double refraction, the stationary image can be produced by :

  1. O-ray

  2. E-ray

  3. Both O-ray and E-ray combined together

  4. Some times O-ray and some times E-ray
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Only for the ordinary ray the refractive index is observed to be constant in all directions

Multiple choice polarisation of light polarisation wave optics optics physics

Consider the following statements A and B. Identify the correct statements.
(A) Polarized light can be used to study the helical structure of nucleic acids.
(B) Optical axis is a direction and not any particular line in the crystal.

  1. A and B are correct

  2. A and B are wrong

  3. A is correct and B is wrong

  4. A is wrong and B is correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nucleic acid is an optically active medium. When circularly polarized light passes through an absorbing optically active medium, the speeds between right and left polarizations differ as well as their wavelengths. This can be used to study the helical structure of nucleic acids.
An optical axis is a line along which there is some degree of rotational symmetry in an optical system. Thus it is a particular direction and not any
random line.

Multiple choice polarisation of light polarisation wave optics optics physics

When unpolarised light passes through a Polaroid sheet the beam that emerges from it is plane polarized. This is due to selective :

  1. absorption of the O-Ray

  2. absorption of the E-Ray

  3. absorption of the E & O Rays

  4. reflection of one of the rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

polaroid has absorption of O- Ray as the phenomenon behind its polarising ability.

Multiple choice polarisation of light polarisation wave optics optics physics

The Polaroid is :

  1. Celluloid film

  2. Big crystal

  3. Cluster of small crystal arranged in a regular way

  4. Cluster of small crystals arranged in a haphazard way
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Polaroid consists of needle - like crystals aligned in a particular direction.
Thus option C is correct answer.

Multiple choice polarisation of light polarisation wave optics optics physics

A calcite crystal is placed over a dot on a piece of paper and rotated. On seeing through the calcite, one will see : 

  1. One dot

  2. Two stationary dots

  3. Two rotating dots

  4. One dot rotating about the other
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

calcite crystal display an optical property called birefringence. This causes objects viewed through a clear piece of calcite to appear doubled.
This is the reason one will see one dot rotating about the other.

Multiple choice polarisation of light polarisation wave optics optics physics

Consider the following statements A & B. Identify the correct choice in the given answers.
(A) The refractive Index of the extra-ordinary ray depends on the angle of incidence in double refraction
(B) The vibrations of light waves acquire onesidedness for both ordinary and extraordinary rays in double refraction

  1. A & B are wrong

  2. A & B are correct

  3. A is correct B is wrong

  4. A is wrong B is correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In double - refraction the refractive index of the extra - ordinary ray varies according to the direction taken because it has components that  are both parallel and perpendicular to the crystal's optic axis. Thus (A) is correct.
The ordinary ray and the extraordinary ray are polarized in planes vibrating at right angles to each other. Thus (B) is correct.

Multiple choice polarisation of light polarisation wave optics optics physics

If $\mu _{O}$ and  $\mu _{e}$ are the refractive indices of a double
refracting crystal, then
1)  $\mu _{O}$ < $\mu _{e}$ for quartz crystal
2)  ,$\mu _{O}$ > $\mu _{e}$ for calacite crystal

  1. both 1 and 2 are true

  2. 1 is true 2 is false

  3. 1 false 2 is true

  4. both 1 and 2 are false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For quartz crystal $\mu _{0}=1.544  ;  \mu _{e}=1.553$
For calacite crystal $\mu _{0}=1.658  ;  \mu _{e}=1.486$
Thus both a and b are true.

Multiple choice polarisation of light polarisation wave optics optics physics

Huygens wave theory could not explain

  1. reflection of light

  2. refraction of light

  3. interference of light

  4. double refraction
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Huygens waves theory could well explain reflection, refraction and interference of light but could not explain the double refraction because in huygens principle light is considered as mechanical wave which could not explain the double refraction.

Multiple choice polarisation of light polarisation wave optics optics physics

The tourmaline crystal

  1. Absorbs ordinary light and transmits extra ordinary

  2. Absorbs extra ordinary light and transmits ordinary light

  3. Both absorbs ordinary and extra ordinary light

  4. Both transmits ordinary light and extra ordinary light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Some transparent crystals, such as tourmaline and calcite, have the property that when one views an object through them one sees two images of the object. If one passes a narrow beam of light through them, the refracted beam is split into two parts which travel through the crystal and emerge as two separate beams. One of the beams obeys the ordinary laws of refraction and is called the ordinary ray. The other beam is called the extraordinary ray. The extraordinary ray does not always lie in the plane of incidence. Its speed, and consequently its index of refraction, depends on its direction of propagation through the crystal.

Since the speed of the emerging rays and angle are different, the emergent rays are circularly or optically polarized.
Hence both ordinary and extraordinary light are transmitted.
The correct answer is option D.

Multiple choice polarisation of light polarisation wave optics optics physics

What happens to electric field component when unpolarized light is incident on surface such that reflected and refracted light are at right angles?

  1. Parallel component remains in reflected light

  2. Prependicular component remains in reflected
    light

  3. It will remain unpolarized

  4. Partially polarised reflected light.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When unpolarized light is incident at Brewster's angle, the reflected light is plane-polarized. The electric field component perpendicular to the plane of incidence remains in the reflected light, while the parallel component is refracted.