What structure is used to focus light in a reflecting telescope?
convex lens
plane mirror
concave mirror

Concave mirror

Explanation:

Reflecting telescopes is a type of telescope that uses mirrors instead of lens. This is because mirrors are lighter and thus are easier to make perfectly smooth as compared to lenses.Reflecting telescopes use concave mirrors for the purposes of bringing light gathered to a certain focus. Concave mirror in reflecting telescopes collects parallel rays from the object and forms an image at the focal point.

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.