Question

On heating a liquid, the refractive index generally
a)decreases
b)increases
c)does not change
d)increase or decrease depending upon rare of heating

Answer 1

On heating a liquid, its refractive index generally decreases.

This is due to the decrease in density of the liquid on heating and the space between the molecules increases by some amount.

Thus the refractive index of the liquid will decrease when we increase its temperature by heating the liquid.

Answer 2

$\textbf{(a) decreases }$

This can be explained as,

This happens due to the decrease in density of the liquid on heating and the space between the molecules increases by some amount.

Thus the refractive index of the liquid will decrease when we increase its temperature by heating the liquid.