Find the focal length of a lens of power `- 2.0 D`. What type of lens is this ?

Explanation

To find the focal length of a lens given its power, we can use the formula that relates power (P) and focal length (F):

1. **Formula**: The relationship between power (P) and focal length (F) is given by:
\[ P = \frac{1}{F} \]

2. **Given Data**: We are given the power of the lens:
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