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The surfaces of the sun glasses (goggles...

The surfaces of the sun glasses (goggles) are curved, yet their power may be zero. Why ?

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Both the surfaces of sun glasses are curved. Also,
`R_1 = R_2`
As `P = (mu - 1)((1)/(R_1) - (1)/(R_2))`
`:. P = 0`.
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