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Why sunglasses have zero power ?...

Why sunglasses have zero power ?

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Sunglasses are made by glasses curved from both sides such that radius of curvature of both the surfaces, inner and outer, is same.
`R_("inner")=R_("outer")`
`therefore" Power, P"=(mu-1)((1)/(R_("inner"))-(1)/(R_("outer")))=0`
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