A 90-nm-thick coating is applied to the lens. What must be the coating's index of refraction to be most effective at 480 nm? assume that the coating’s index of refraction is less than that of the lens.

Which of the following must happen in order for productivity to increase? a. production levels remain unchanged while inputs increase. b. production levels rise while inputs decrease. c. production levels fall while inputs increase.

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.

What are the requirements to be eligible for the saep scholarship?