Atree is located between a convex lens and its focal point. which answer describes the image of the tree formed by the lens? it is a reduced virtual image. it is a reduced real image. it is an enlarged real image. it is an enlarged virtual image.

Answer D It is an enlarged virtual image.

As shown in the figure, any ray parallel to principal axis passes through focus f2 and any ray incident at center of convex lens passes straight. The rays never meet on the other side of the lens but appear to meet on the tree side only. Therefore an enlarged virtual image is formed. A virtual image is formed when ray do not intersect but appear to intersect when produced backwards.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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