A thin made of glass of refractive index...

A thin made of glass of refractive index `1.5` has a front surface `+11 D` power and back surface `-6D` . If this lens is submerged in a liquid of refractive index `1.6`, the resulting power of the lens is

`-0.5 D`

`+0.5 D`

`-0.625 D`

`+0.625 D`

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