If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ?

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#### Solution

Since, power of a lens is given by the relation

`P=1/f` (in metres)

p = 10 D (given)

`10 = 1/f`

`f = 1/10`

`f= 0.1 m`

Therefore, the focal length of the lens is 0.1 m as the lens is concave in nature.

Concept: Refraction of Light - Concave Lens

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