Speed of light in vacuum is 3 x 10⁸ m/s. Then speed of light in glass (refractive index 1.5) will be:
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[D] 2.0 x 10⁸ m/s
v = c/µ = 3 x 10⁸/1.5 = 2.0 x 10⁸ m/s.
Here, correct option will be [D].