2(d)
How is the refractive index of a material related to?
(i) real and apparent depth?
(ii) velocity of light in vacuum or air and the velocity of light in a given medium?
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(i) Refractive index (μ) = $\frac{\text{Real depth}}{\text{Apparent depth}}$
(ii) Refractive index (μ) = $\frac{\text{Speed of light in vacuum or air}}{\text{\text{Speed of light in given medium }}}$