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p=1/f
f=1/p
f=1/(-4.5)
f=-0.2222m
f=-22.22cm
focal length is negative for diverging lens (or) concave lens
this lens is used by the people suffering from myopia (short-sighted ness)
Myopia occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye. This causes light rays to focus at a point in front of the retina, rather than directly on its surface.
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