what are paraxial rays
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The commonly used optical expressions like the lens equation are approximations which are only valid for light rays close to the optic axis for which the approximation sinθ ≈ θ is valid.
Such rays are called "paraxial rays".
A paraxial ray makes a small angle to the principal axis of the system and lies close to the axis.
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The rays traveling very close to the principal axis & make small angles with it r called Paraxial rays.
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