For refraction of light from air to rock salt, water and diamond if:
$V$ - Velocity of light in air
$V_{1}$ - Velocity of light in rock salt
$V_{2}$ - Velocity of light in water
$V_{3}$ - Velocity of light in diamond, then
Choose the correct alternative

V_{3} > V_{1} > V_{2} > V

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V > V_{2} > V_{1} > V_{3}

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V > V_{1} > V_{2} > V_{3}

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V_{1} > V > V_{3} > V_{2}

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Solution

The correct option is B $V > V_{2} > V_{1} > V_{3}$
We know that,
Refractive index of the material,
$μ = \frac{c}{v}$
So,
$n_{a}$ for air $= 1$
$n_{w}$ for water $= 1.3$
$n_{r}$ for rock salt $= 1.5$
$n_{d}$ for diamond $= 2.4$
$n_{a} < n_{w} < n_{r} < n_{d}$ as $n \propto \frac{1}{V}$
$V_{a} > V_{w} > V_{r} > V_{d}$
i.e. $V_{1} > V_{2} > V_{1} > V_{3}$

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For refraction of light from air to rock salt, water and diamond if:V- Velocity of light in airV1- Velocity of light in rock saltV2- Velocity of light in waterV3- Velocity of light in diamond, thenChoose the correct alternative

The correct option is B V>V2>V1>V3We know that,Refractive index of the material,μ=cvSo,na for air =1nw for water =1.3nr for rock salt =1.5nd for diamond =2.4na<nw<nr<nd as n∝1VVa>Vw>Vr>Vdi.e. V1>V2>V1>V3

For refraction of light from air to rock salt, water and diamond if:
$V$ - Velocity of light in air
$V_{1}$ - Velocity of light in rock salt
$V_{2}$ - Velocity of light in water
$V_{3}$ - Velocity of light in diamond, then
Choose the correct alternative