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

(A) A polarizer transmits only a single orientation of linear polarization and blocks the rest of the light. For example, a polarizer oriented along X passes Ex and blocks Ey. Some polarizers eliminate the non-passed polarization component (Ey in the above example) by absorbing it, while others reflect this component. Absorbing polarizers are convenient when it is desirable to completely eliminate one polarization component from the system. A disadvantage of absorbing polarizers is that they are not very durable and may be damaged by high-intensity light (as found in many laser applications). (B) Indicate z-direction. → Indicate (X-Y) electric field is perpendicular to the incident ray. From Snell's law, Sin iB = μ Sin rB (1) If reflected light and refracted light are perpendicular to each other then reflected light is completely polarized light. This is known as Brewster's law. iB + 90° + r = 180° ∴ r = 90° − iB. By putting the value of r in eq(1), Sin iB = μ Cos iB ∴ tan iB = μ