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Astigmatism:
In this defect the surface of eye is not perfectly spherical. The eye has different focal point in dissimilar planes and image of an object is not focused clearly on the retina.
Correction:
Astigmatism is corrected by asymmetrical lenses which have dissimilar radii of curvature in dissimilar plane.
Explain the concept of coherence.Discuss temporal coherence and spatial coherence.
Consider the 4-f system below where an object is placed at the input plane and is illuminated by a plane wave The object to the right is placed in the input plane where b
if we drill a hile along the diametre of earth and drop a ball inside it then what will happen the ball will occilate or drop down in the space
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