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A ray of light travels from air to water to glass and again from glass to air. Refractive index of water with respect to air is ' $x^{\prime}$, glass with respect to water is ' $y^{\prime}$ and air with respect to glass is 'z'. Which one of the following is correct?
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The correct answer is:
$\mathrm{xyz}=1$
$\mathrm{X}=\frac{\mathrm{V}_{\mathrm{a}}}{\mathrm{V}_{\omega}}, \quad \mathrm{Y}=\frac{\mathrm{V}_{\mathrm{w}}}{\mathrm{V}_{\mathrm{g}}}, \mathrm{Z}=\frac{\mathrm{V}_{\mathrm{g}}}{\mathrm{V}_{\mathrm{a}}}$
$\therefore \mathrm{XYZ}=1$
$\therefore \mathrm{XYZ}=1$
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