Refractive indices of glass, water and kerosene are 1.52, 1.33, 1.44 respectively. In which of these mediums, speed of light will be maximum?
Answer & explanation
Correct answer: option 2
Refractive index = \(\frac{\text{Speed of light in air}}{\text{Speed of light in medium}}\) = \(\frac{c}{v}\)
μ = \(\frac{3 × 10^8}{v}\)
Higher the refractive index, lower will be speed in medium.
Lower the refractive index, higher will be speed in medium.
Lowest refractive index is of water, hence speed of light will be maximum in water.