IGNOU PHE 9 2018 - What is a zone plate? How does a positive zone plate differ from a neg

Question

What is a zone plate? How does a positive zone plate differ from a negative zone plate? Show that each Fresnel half period zone has nearly the same area

27 Jan 2018

Answer :

Word Count : 162

A zone plate is a device used to focus light or other things exhibiting wave character. Unlike lenses or curved mirrors however, zone plates use diffraction instead of refraction or reflection. Based on analysis by Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor. The zone

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