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Porro Prism
An image travelling through a Porro prism is rotated by 180°and exits in the opposite direction offset from its entrance point.Since the image is reflected twice,the handedness of the image is unchanged
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Polo prism
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Porro Prism
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An image travelling through a Porro prism is rotated by 180°and exits in the opposite direction offset from its entrance point.Since the image is reflected twice,the handedness of the image is unchanged.
Porro prisms are most often used in pairs,forming a double Porro prism.A second prism,rotated 90°with respect to the first,is placed such that the beam will traverse both prisms.The net effect of the prism system is a beam parallel to but displaced from its original direction,with the image rotated 180°.As before,the handedness of the image is unchanged.
Double Porro prism systems are used in small opticaltelescopes to re-orient an inverted image(an arrangement is known as a image erection system),and especially in many binoculars where they both erect the image and provide a longer,folded distance between the objective lenses and the eyepieces.
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No.1, Jingwei South Road, Jinghe Industrial Park, Gaoling District, Xi'an City
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