Glasses, cameras, flashlights, binoculars, telescopes and peepholes are all made using __ lenses.
A) concave
B) convex
C) compound
D) converging

B) Concave

Explanation:

These types of lenses (concave ) are characterized because all the light is concentrated in one point, i.e. converge to one point, this point is called Focus.

Normally this type of lens becomes thicker as it approaches the center, in the case of the human eye the lens becomes thicker when looking at nearby objects and thinner when looking at distant objects.

6 cos 34, 6 sin 34 trig

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.