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.

Find an equation in standard form of the parabola that passes through (-2, 9), (-4, 5), and (1, 0)

An ecosystem is shown in the illustration. assume that human activities have led to a decrease in the number of eagles. a virus attack on rabbits has led to a decrease in their population in the ecosystem. which two sentences describe likely effects on the ecosystem? 1. there’s an increase in the number of snakes and insects and a decrease in the number of frogs. 2. there’s an increase in the number of snakes and insects, and the storks face increased competition for food. 3. there’s an increase in the number of storks and a decrease in the number of snakes and insects. 4. there’s an increase in the number of frogs and a decrease in the number of storks and insects. 5. there’s a decrease in the number of snakes, insects, and frogs.

The different layers of gases that extend form the surface of the earth into space