9. The image formed by a convex mirror will
a, always be real
b. always be virtual
c. be either real or virtual
d. will always be magnified
10. The focal length is one-half the distance from the vertex to the
a center of curvature
c. radius of curvature
b. principal axis
d. none of the above
11. The focal length is denoted by the letter
. F
C.P
d. p
12. A spherical mirror with reflecting surface curved inwards is called
9. concave mirror
b. convex mirror
c. curved mirror
d. none of the above
13. The distance from the focal point to the vertex is called
a. center of curvature
c. focal point
b. focal length
d. vertex
14. Which lens is used to magnify objects and refract light? This type of lens is curved
outward.
2. concave lens b. convex lens
c. parabolic lens d. plane lens
15. Which describes a concave lens?
a. more transparent in the middle
b. thinner in the middle than on the edges
c. thinner on the edges than in the middle
d. triangular in shape.​