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Green light of wavelength $5460 Å$ is incident on an airglass interface. If the refractive index of glass is $1.5$, the wavelength of light in glass would be $\left(\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}\right)$
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$3640 Å$
$\mathrm{a}^{\lambda} \mathrm{g}=\frac{\lambda_{\mathrm{a}}}{\mu}=\frac{5460}{1.5}=3640 Å$
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