1.what is polaroid?hoe are they constructed ? mention their important application?
2.state law of malus and draw an intensity v/s angle between the plane of transmission of polarizer and analyzer?
3.state brewsters law and prove that the reflected and refracted rays are mutually perpendicular at the angle of polarization?
Asked by mahamood.iphone | 22nd Dec, 2015, 12:35: PM
Expert Answer:
3. Brewsters law:
According to this law, when unpolarized light is incident at polarizing angle, ip on an interface separating air from a medium of refractive index μ, then the reflected light is fully polarized (perpendicular to the plane of incidence), provided μ = tan ip. This relation represents Brewster's law.
It has been observed experimentally that when light is incident at polarizing angle, the reflected component along OB and refracted component along OC are mutually perpendicular to each other.
Thus, in fig.,
where, r is the angle of refraction.
or
90º - ip = r
According to Snell's law,
This proves Brewster's law.
We can prove that in case of refletion at Brewster's angle, reflected and refracted rays are mutually perpendicular.
According to Brewster's law,
According to Snell's law,
sin r = cos ip = sin (90º - ip)
r = 90º - ip or ip + r = 90º
In fig,
r' = ip
r' + r = 90º
Note: Ask the other questions as a separate separate query.
r' + r = 90ºAnswered by Faiza Lambe | 22nd Dec, 2015, 03:48: PM
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