Choose the correct answer from alternatives given.
A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is

blue

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green

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violet

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red

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Solution

The correct option is D red
Since $λ_{r} > λ_{g} > λ_{b} > λ_{v}, < μ_{g} < μ_{b} < μ_{v} (∵ μ = a + b / λ^{2})$
$∴ v_{r} > v_{g} > v_{b} > v_{v} (∵ v = c / μ) .$
After travelling through the slab, red colour will emerge first because it has largest velocity in slab.

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Choose the correct answer from alternatives given.A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is

The correct option is D redSince λr>λg>λb>λv,<μg<μb<μv(∵μ=a+b/λ2)∴vr>vg>vb>vv(∵v=c/μ).After travelling through the slab, red colour will emerge first because it has largest velocity in slab.

Choose the correct answer from alternatives given.
A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is

The correct option is D red
Since $λ_{r} > λ_{g} > λ_{b} > λ_{v}, < μ_{g} < μ_{b} < μ_{v} (∵ μ = a + b / λ^{2})$
$∴ v_{r} > v_{g} > v_{b} > v_{v} (∵ v = c / μ) .$
After travelling through the slab, red colour will emerge first because it has largest velocity in slab.