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Lens Maker's Formula

When a lens o...

Question

When a lens of refractive index $n_{1}$ is placed in a liquid of refractive index $n_{2}$ , the lens looks to be disappeared only, if

A

n_{1} = n_{2} / 2

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B

n_{1} = 3 n_{2} / 4

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C

n_{1} = n_{2}

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D

n_{1} = 5 n_{2} / 4

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Solution

The correct option is C $n_{1} = n_{2}$
Path of light rays will not change if $n_{1} = n_{2}$ and hence rays will pass through liquid lens combination un-deviated which makes lens disappear.

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