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The light is the beam of photons and its velocity is 300000km/sec.
The velocity is defined as the distance travelled in a unit time.
The optical instrument is the instrument in which the light is used as the beam.
The magnet has two poles and due to which the magnetic field is produced around the magnet.When any object is put into the field,the force acting on that object by the magnetic field is called the magnetic effect.
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