Refractive index of glass with respect to medium is 4/3. If (vm - 6.25 x 107 then Vg) velocity of light in medium is (a) 2.5x108 m/sec. 225 x 108 m/ser (b) 1.5 x 107 m/sec. (d) 4.5 x 107 m/sec.
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