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.

it is the second option.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.