According to $Ohm's$ law, the potential difference across a conductor is directly proportional to the current through it.
$V = IR$
Hence the curve is a straight line passing through origin.
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Reason : In a prism kept in air, a ray is incident on first surface and emerges out of second surface. Now if another ray is incident on second surface (of prism) along the previous emergent ray, then this ray emerges out of first surface along the previous incident ray. This particle is called principle of reversibility of light.
