Tag: optics

Quizzes (33) Questions (198)

Questions Related to optics

Multiple choice polarisation of light polarisation wave optics optics physics

Optically active substances are those substances which 

  1. produces polarised light

  2. produces double refraction

  3. rotate the plane of polarisation of polarised light

  4. converts a plane polarised light into circularly polarised light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

By definition, optically active substances are those which can rotate the plane of polarisation of polarised light.

Multiple choice polarisation of light polarisation wave optics optics physics

Polaroid glass is used in sun glasses because

  1. it reduces the light intensity to half on account of polarisation

  2. it is fashoinable

  3. it has good colour

  4. it is cheaper
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polaroid glass cut glare and haze by reducing the light intensity to half on account of polarisation, so that eyes are more comfortable and viewer can see better, therefore they are used in sun glasses.

Multiple choice polarisation of light polarisation wave optics optics physics

A nicol prism is based on action of

  1. refraction

  2. double refraction

  3. dichroism

  4. both (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a ray of light enters nicol prism, it splits into two plane polarised light in mutually perpendicular direction. One of this light undergoes total reflection and absorption whereas other comes out as a plane polarised light.

Multiple choice polarisation of light polarisation wave optics optics physics

If a polaroid is kept in the path of an uniformly unpolarised light, the intensity of the transmitted light to the intensity of the light when the polaroid was not kept in its path is.

  1. 1
  2. $\dfrac{1}{2}$
  3. $\dfrac{1}{\sqrt 2}$
  4. $\dfrac{1}{2\sqrt 2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The component of the electric vector of all the electric vectors of unpolarised light in one direction only = $\dfrac {E _0}{\sqrt {2}} $
And, $I \propto E^2 \Rightarrow I = \dfrac {I _0}2 $
Multiple choice polarisation of light polarisation wave optics optics physics

A Nicol prism can be used.

  1. For producing and analysing polarised light

  2. Only to analyse polarized light

  3. Only to produce polarized light

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A Nicol prism is use to produce and analyse the polarised light.

Multiple choice polarisation of light polarisation wave optics optics physics

The angle of incidence at which reflected light is totally polarized form aim is :

  1. $\sin ^ { - 1 } ( n )$
  2. $\sin ^ { - 1 } \left( \frac { 1 } { n } \right)$
  3. $\tan ^ { - 1 } \left( \frac { 1 } { n } \right)$
  4. $\tan ^ { - 1 } ( n )$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Brewster's law states that the angle of incidence i for which reflected light is totally polarized is given by tan(i) = n, where n is the refractive index.