1) Which angle is measured from the refracted ray to the normal line?
a. angle of incidence c. angle of reflection
b. angle of refraction d. boundary angle
2) What happens to a light ray when it crosses the boundary between two
transparent media? It _____________.
a. is reflected c. will be refracted
b. stops moving d. is absorbed
3) How would the angle of incidence compare to the angle of refraction if light
travels from more dense to less dense material?
a) angle of incidence is equal to angle of refraction
b) angle of incidence is smaller than the angle of refraction
c) angle of incidence is greater than the angle of refraction
d) a comparison between the angles cannot be determined
4) How is the normal line drawn? The normal line is drawn such that it forms a 90-
degree angle with ___________ at the point where the incident ray crosses into
the ___________
a. boundary; refracted ray c. reflecting surface; first medium
a. boundary; second medium d. reflecting surface; refracted ray
Assessment
Additional Activities
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5) Which of the following is/are NOT characteristic/s of an image produced in a
concave lens?
I. The image formed is real.
II. The image is formed on the object side.
III. It is always smaller than the object being refracted.
IV. It is always formed between the focus and the vertex
a. I only b. III only c III and IV d. I and IV
6) Why does a convex lens have a positive focus?
a. The light rays that hit this type of lens are converged.
b. A convex lens diverges light rays that pass through it.
c. Light rays that are incident on a convex lens do not refract.
d. A convex lens creates an imaginary focus on the object side.
7) What happens if there is an incident ray that travels straight towards the vertex
of a lens?
a. It travels in a straight line as if it were not refracted.
b. The light ray will be refracted to the focus of the lens.
c. The angle of refraction will be measured as 90-degrees.
d. It will be absorbed and therefore not pass through the lens.
8) Which statement is TRUE about images formed by lenses?
a. Real images are found on the object side.
b. Virtual images are found on the object side.
c. Images produced are always bigger than real object.
d. Images produced are always smaller than real object.
9) Which of the following sets of values is correct according to the thin lens
equation?
a. f = -3 cm, p = 9 cm, q = -5 cm c. f = -8 cm, p = -7 cm, q = 42 cm
b. f = 3 cm, p = 6 cm, q = 6 cm d. f = 2 cm, p = -5 cm, q = -10 cm
10) How are the points F, 2F and V arranged in a lens set-up?
a. 2F is between F and V c. F is between V and 2F
b. V is between F and 2F d. V is located beyond 2F
11) Which type of image CANNOT be projected into a screen because it is created
by the meeting of virtual rays instead of real light rays?
a. real image c. magnified image
b. virtual image d. diminished image
12) When is a virtual image formed in a convex lens? It is when we place the
object ______________.
a. at 2F c. between F and V
b. at F d. between 2F and F
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13)Where will the image be formed if a real object is placed 16 cm in front of a
convex lens whose focal length is 12 cm?
a. same side as object, 48 cm from the vertex
b. same side as object, 24 cm from the vertex
c. opposite side of object, 48 cm from the vertex
d. opposite side of object, 24 cm from the vertex
14) How is the refracted ray drawn for an incident ray whose direction is parallel to
the principal axis? It is drawn such that it will _________________________.
a. pass through or align with the center of curvature
b. pass through the real focus or align with the virtual focus
c. align with the real focus or pass through the virtual focus
d. follow the direction that is perpendicular with the principal axis
15) What happens when an object is placed at F using a concave lens?
a. no image will be formed
b. an inverted but enlarged image is formed
c. an upright but diminished image is formed
d. image with the same size as the object is formed
A.
A.
B.
A.
B.
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