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A plate which induces the desired amount of phase difference between two rays is known as ___________

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A plate which induces the desired amount of phase difference between two rays is known as ___________

(a) Polaroid

(b) Phasor plates

(c) Retardation Plates

(d) Quartz plates

The question was posed to me during a job interview.

My doubt stems from Polarization topic in portion Optics of Engineering Physics II

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Right option is (c) Retardation Plates

Explanation: Sometimes, it is required to induce a certain phase difference between E-ray and O-ray. For that, a plate with a specific thickness is chosen to induce that phase difference. This plate is known as the retardation plate as it retards the motion of one of the rays.

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