Question

Which of the following is not used in a telescope?
Select one:
a. Concave Mirror
b. Concave Lens
c. Convex Mirror
d. Convex Lens​

Answer 1

Answer:

convex mirror is not used in a telescope

Answer 2

d. convex lens

As a convex lens creates blurs and distortion, telescope and binocular manufacturers install concave lenses before or in the eyepiece so that a person can focus more clearly.