Because of dispersion, either lens alone would focus red rays and blue rays at different points. define δn1 and δn2 as nblue−nred for the two lenses. find an expression for the ratio δn1/δn2 that makes fblue=fred for the two-lens system. that is, the two-lens system does not exhibit chromatic aberration.

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.

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