Physics

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An optometrist has perscribed you 2D glasses. This means
a) you are farsighted and the focal lenght of your glasses lens is +.5m
b)you are nearsighted and the focal lenght of your glasses lens is +.5m
c)you are farsighted and the focal lenght of your glasses lens is -.5m
d)you are nearsighted and the focal lenght of your glasses lens is -.5m

I am really confused with this question But i think it's a).

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