A thin convergent glass lens (mug=1.5) h...

A thin convergent glass lens `(mu_g=1.5)` has a power of `+5.0D.` When this lens is immersed in a liquid of refractive index `mu_1,` it acts as a divergent lens of focal length `100 cm.` The value of `mu_1` is

`(5)/(3)`

`(5)/(4)`

`(6)/(3)`

None of these

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