what is zone plate in Fresnel diffraction?
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A zone plate is a device used to focus light or other things exhibiting wave character. Unlike lenses or curved mirrors however, zone plates usediffraction instead of refraction or reflection.
A zone plate is a device used to focus light or other things exhibiting wave character. Unlike lenses or curved mirrors however, zone plates usediffraction instead of refraction or reflection.
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A zone plate is used for focusing light, like a lens. However, light through a lens undergoes refraction but light through a zone plate undergoes diffraction. This is based on the principle of Fresnel Lenses - and so is known as Fresnel Zone Plate.
A magnifying glass - or a condenser lens - is thick in the middle - a convex lens. It would not be very easy to make a large magnifying glass lens because it would be thick, heavy and hard to mount. A fresnel lens is flat on one side and ridged on the other side.
A magnifying glass - or a condenser lens - is thick in the middle - a convex lens. It would not be very easy to make a large magnifying glass lens because it would be thick, heavy and hard to mount. A fresnel lens is flat on one side and ridged on the other side.
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