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A glass lens of refractive index 1.45 wh...

A glass lens of refractive index `1.45` when immersed in a transparent liquid becomes invisible. Under what condition does it happen ?

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When refractive index of the liquid is equal to refractive index of the material of the lens `= 1.45`.
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A lens immersed in a transparent liquid becomes invisible. Under what condition does it happen ?

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