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(a) How does one demonstrate, using a su...

(a) How does one demonstrate, using a suitable diagram, that unpolarised light when passed through a Polaroid gets polarised?
(b) A beam of unpolarised light is incident a glass-air interface. Show using a suitable ray diagram, that light reflected from the interface is totally polarised, when `mu=tani_(B)`, when `mu` is the refractive index of glass with respect to air and `i_(B)`, is the Brewster's angle.

Answer

Step by step text solution for (a) How does one demonstrate, using a suitable diagram, that unpolarised light when passed through a Polaroid gets polarised? (b) A beam of unpolarised light is incident a glass-air interface. Show using a suitable ray diagram, that light reflected from the interface is totally polarised, when mu=tani_(B), when mu is the refractive index of glass with respect to air and i_(B), is the Brewster's angle. by PHYSICS experts to help you in doubts & scoring excellent marks in Class 12 exams.

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How does one demonstrate, using a suitable diagram, that unpolarised light when passed through a polaroid gets polarised?

A beam of unpolarised light is incident on a glass-air interface. Show, using a suitable ray diagram, that light reflected from the interface is totally polarised, when mu = tan i_B , where mu , is the refractive index of glass with respect to air and i_B is the Brewster’s angle.

Knowledge Check

  • A ray of unpolarised light is incident on a glass plate of refractive index 1.54 at polarising angle, then angle of refraction is :

    A
    `33^(@)`
    B
    `44^(@)`
    C
    `57^(@)`
    D
    `90^(@)`

  • When unpolarised light beam is incident from air onto glass ( n=1.5 ) at the polarising angle

    A
    (a) Reflected beam is polarised 100 percent
    B
    (b) Reflected and refracted beams are partially polarised
    C
    (c) The reason for (a) is that almost all the light is reflected
    D
    (d) All of the above

  • Assertion (A) : When an unpolarised light is incident on a glass plate at Brewster angle, the reflected ray and refracted ray mutually perpendicular Reason (R ) : The refractive index of glass is equal to sine of the angle of polarisation.

    A
    Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'
    B
    Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
    C
    A' is true and 'R' is false
    D
    A' is false and 'R' is true

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    A beam of unpolarized light is incident on a glass air interface. Show, using a suitable ray diagram that light reflected from the interface is totally polarized by reflection from a transparent medium. Write expression for Brewster's angle.

    Unpolarised light is incident on a plane surface of glass of glass of refractive index n at angle i . If the reflected light gets totally polarised, write the relation between the angle i and refractive index n.

    Unpolarized light is incident on a plane surface of glass of refractive index mu at angle i . If the reflected light gets totally polarized, write the relation between the angle i and refractive index mu .

    (a) What is linearly polarised light ? Describe briefly using a diagram how sunlight is polarised (b) Unpolarised light is incident on a polaroid. How would the intensity of transmitted light change when the polaroid is rotated ?

    The angle of incidence at which reflected light is totally polarised for reflection from air to glass (refractive index n) is

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