Question

use of concave and convex lence​

Answer 1

Answer:

Concave Lenses Are for the Nearsighted, Convex for the Farsighted. Concave lenses are used in eyeglasses that correct nearsightedness. Because the distance between the eye's lens and retina in nearsighted people is longer than it should be, such people are unable to make out distant objects clearly.

Answer 2

Answer:

Luster Silk has a shiny, shimmery appearance. Wool doesn't have a shine.

Insulating Properties Silk is not as good as wool in retaining warmth. Wool has good insulating properties