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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.
There are a variety of patterns that could be generates through vibrations inside a string, slinky, or rope. Every pattern corresponds to vibrations that occur at a particular freq
Electrons and holes in semi-counductor Metals have free electrons available in conduction band for conduction of electric current. As the valence band overlaps the conduction b
Suppose Fluid (say, water) occupies a domain D and has velocity field V=V(x, t). A substance (say, a day) is suspended into the fluid and will be transported by the fluid as well
Determine the HVL of photons in air, water, muscle, bone, and Pb for energies of 5 keV, 100 keV, 1 Mev and 100 MeV and then fill in the table below. Note that you must find the HVL
Visible Radiation (Waves): Visible waves have a wavelength range among 400 and 700 nanometre.
Causality principle The principle which cause has to always preceed effect. More formally, if an event A ("the cause") somehow effect an event B ("the effect") that occurs lat
Example of an impure spectrum
You are offered with two strips of metallic foil two strips of waxed paper and two metal paper clips. Every strip is in the shape of a rectangle 2 inches wide and 5 feet long. Whic
Q. Why nichrome is used as heating element in electric heating devices? Nichrome, an alloy of nickel as well as chromium is used as the heating element for the following reaso
a) A positive point test charge q 0 is placed at the midpoint p among the two equal positive charges q. What forces acts on it at or near this point p? b) Two charges 1X10 -
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