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Question
If the velocity and wavelength of light in air is Va and λa and that in water is Va and λw, then the refractive index of water is ______.
Options
`"V"_"w"/"V"_"a"`
`"V"_"a"/"V"_"w"`
`lambda_"w"/lambda_"a"`
`("V"_"a"lambda)/("V"_"w"lambdaw_"")`
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Solution
If the velocity and wavelength of light in air is Va and λa and that in water is Va and λw, then the refractive index of water is `underline("V"_"a"/"V"_"w")`.
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