How does a refracting telescope work?
a. it uses a concave lens, a convex lens, and a concave mirror to gather and focus light.
b. it uses a concave lens and a convex lens to gather and focus light.
c. it uses two concave lenses to gather and focus light.
d. it uses two convex lenses to gather and focus light.

D

Explanation:

because convex lenses bend light inward

It uses two convex lenses to gather and focus light.

Explanation:

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.