Article subjects are automatically applied from the ACS Subject Taxonomy and describe the scientific concepts and themes of the article. In developed countries, the concentration of Cu(II) ions in ...

\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

It's not that these subjects shouldn't be covered, but how odd to expect lay readers to plough through genetics equations and lens diagrams before even the two main types of cell are defined. In the ...