Answer it is very tufe
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P = 1/F
-0.5 = 1/f
F = 1/-0.5
F = -2
So, if the focal length is negative then the lens is a concave lens.
As we all know that concave lens is a diverging lens.
Also it's diverging property helps the eye to create a clearer image on the retina.
Explanation:
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