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Power of a Lens

How is the si...

Question

How is the sign (+ or -) of power of a lens related to its divergent or convergent action ?

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Solution

The sign of power depends on the direction in which a light ray is deviated by the lens. The power could be positive or negative. If a lens deviates a ray towards its centre (converges), the power is positive and if it deviates the ray away from its centre (diverges), the power is negative.

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