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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.
Q. Define critical temperature. The temperature at that electrical resistivity of the material suddenly drops to zero and the material changes from normal conductor to a super
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Speed of light (in vacuo); c The speed on which electromagnetic radiation propagates within a vacuum; it is described as 299 792 458 m/s.
state the conditions under which two forces form a couple and give an example of couple
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Ac equivalent circuit
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