Question

a.
Select the correct statement from the following:
device X is a concave mirror and distance d is its focal length.
b. device X is a concave mirror and distance d is the radius of curvature.
device X is a convex lens and distance d is its radius of curvature.
d. device X is a convex lens and distance d is the its focal length.
C.​

Answer 1

Answer:

I think the d point is the correct answer