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Q.

Power of the concave lens is [[1]].

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Detailed Solution

The power of the concave lens is negative.
In optics, power is described as the ability of the optical instrument to bend the rays of light falling on it. Power is positive if an instrument bends the rays towards the optical axis. Power is negative if an instrument bends the rays away from the optical axis. If the instrument does not bend rays, then power is zero.
The power of a lens (

P

) is the reciprocal of its focal length (

f

). The S I unit of power of lens is Dioptre represented by

D

.
Mathematically,

P = \frac{1}{f}

We know a concave lens diverges the rays incident on it. That’s why it is also known as a diverging lens. Hence, its power is negative.

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