The refractive indices of four substances A ,B ,C and D are 1.5620, 1.3625, 1.7750 and 1.3215 respectively . The speed of light is the maximum in the substance :
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Speed of light ,v=
μ
c
where c=speed of light in vacuum
and μ = refractive index of medium
Hence, for maximum speed, μ should be minimum.
Hence, speed of light will be maximum in W having minimum μ.
Answer-(A).
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