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Refractive Index of glass with respect to water can be calculated by 

(Refractive Index of glass with respect to air) × (1/Refractive Index of water with respect to air)

We know that,

Refractive Index of glass with respect to air = 4/3

Refractive index of water with respect to air = 3/2

Hence, Refractive Index of glass with respect to water = (4/3) x (2/3) = 8/9.

We can never eat lunch and dinner for our breakfast.

In a parliamentary system, the members of the cabinet are drawn from the legislative branch.

Smoking can lead to emphysema as well as strokes is the true statement regarding tobacco use. Emphysema is related to the failure of lungs air sacs and cilia that eliminate the dust from the body.

The Mesoamerican leader Pakal, The great was the king of a Maya city-state in the history.

Primary productivity refers to plants that make their own food using sunlight, water and availability of nutrients. Hence, they are not limited by time.

The causes for the French Revolution in the year 1780 includes Social, Cultural, Political, Financial and Economical.

The expansion of the rail networks led to better transport system for trading between many parts of the nation and the steel is the main component in making the rails and the locomotive itself resulting in the growth of the steel industry.