1.

What is meant by plane polarised light? An unpolarised light is incident at an angle θ on the surface of glass of refractive index μ. If the reflected and refracted rays are perpendicular to each other, then obtain the relationship between μ and θ.

Answer»

• Plane polarised light is a term used to describe the polarisation state of the source light used in polarising microscopes. 

• Polarised light is light that vibrates in a single direction due to its passage through a polariser. 

• In a polarising microscope the lower polariser is usually orientated so that light vibrates parallel to the E-W direction. 

• If the upper polariser (the analyser), is not inserted the view is said to be under plane polarised light, often abbreviated to PPL.



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