A light passing through air has wavelength $λ = 600 n m$ . Wavelength, when same ray passes through a glass slab of refractive index 1.5 is:

4000

A^{\circ}

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2000 A^{\circ}

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8000

A^{\circ}

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1200

A^{\circ}

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Solution

The correct option is A $4000$ $A^{\circ}$
We have
$\frac{μ}{μ^{'}} = \frac{λ^{'}}{λ}$
where, $λ$ and $λ^{'}$ respectively are the wavelength of the light in air and in glass slab.
$μ$ and $μ^{'}$ is the refractive index of air and glass slab respectively.
We have $μ = 1$ and $μ^{'} = 1.5$
$⟹ λ^{'} = \frac{600 n m}{1.5} = 400 n m = 4000 A^{o}$

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