Question

A light ray enters from medium A to medium B as shown in the figure.The Refractive Index of medium B with respect to medium A will be:
Greater than Unity,Equal to Unity,Zero,less than unity​

Answer 1

→$\large\mathcal\pink{Less\:\:than\:\:unity}$

$\large\bf\red{Explanation✓}$

Here the ray of light bends away from normal when it enters from medium A into medium B. This shows that medium B is optically rarer than medium A. Therefore, speed of light in medium B is more than the speed of light in medium A. So, the ratio of the speed of light in medium A to the speed of light in medium B will be less than one.