(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.
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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.
A ray of unpolarised light is incident on a glass plate of refractive index 1.54 at polarising angle, then angle of refraction is :
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 .
When unpolarised light beam is incident from air onto glass ( n=1.5 ) at the polarising angle
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.
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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