Absolute refractive indices of water and glass are $\frac{4}{3}$ and $\frac{3}{2}$ respectively. In which one of the two media is the speed of light more?

Question

At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen ?

Answer 1

A lower refractive index allows light to travel faster. Because water's refractive index ($\frac{4}{3} = 1.33$) is less than glass's ($\frac{3}{2} = 1.5$), light moves quicker in water.

Case	Mirror	Focal Length (cm)	Object Distance (cm)
1	A	20	45
2	B	15	30
3	C	30	20

Absolute refractive indices of water and glass are $\frac{4}{3}$ and $\frac{3}{2}$ respectively. In which one of the two media is the speed of light more?

Solution and Explanation

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