A lens has a focal length of, -10cm. What is the power of the lens and what is its nature?
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$\text{f}=-10\text{cm}=0.1\text{m}$$\text{P}=\frac{1}{\text{f}}=\frac{1}{(-0.1)}=-10\text{D}$
It is a concave lens.
It is a concave lens.
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