What is optical density and how is it different from mass density ?

Distinguish between physiological and agricultural density. How are they different from the density of a country?

Physical density and optical density

Find out from table 10.3 of the text-bool, the medius having highest optical density. Also find the midum with lowest optical density?

What is population density ? Explain any three different ways the population density can be measured with the of an example of each.

What is ecological density, crude density and population density ?

Find out from table ,the medium having highest optical density. Also find the medium with lowest optical density.

Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.