Question

please answer this
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Answer 1

Actually, Ng = 3 / 2 and N w = 4/3 . Absolute refractive index of a medium = Speed of light in vacuum / Speed of light in the medium Speed of light in glass = 2× 10 8 m/s Speed of light in vacuum = (3/2) ×2× 10 8 m/s =3× 10 8 m/s Speed of light in water =( 3×10 8 m/s ) /(4/3)
So speed of light in water is 2.25 × 10 8 m/ s .