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Question
If the difference in velocities of light in glass and water is 2.7 x 107 m/s, find the velocity of light in air. (Refractive index of glass = 1.5, Refractive index of water = 1.333)
Solution
`u=C/v`
`:.v_g=C/mu_g`
`v_w=C/mu_w`
`:.v_w-v_g=C/mu_w-C/mu_g`
`2.7xx10^7=C(3/4-2/3)`
`2.7xx10^7=C((9-8)/12)`
C = 2.7x12x107
=3.24x108m/ s
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