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Optics Written Test
School Name:
Team Number:
Science Olympiad
Fairfax High School Invitational
January 7, 2017
Optics C
School Name: ____________
Team Number: _____
Student Names: _____________________________
DO NOT OPEN THIS TEST UNTIL INSTRUCTED TO DO SO.
Write your team name and number on each page.
When your team number is called, proceed to the laser shoot.
Optics Written Test
School Name:
Team Number:
Directions: Fill in your response for each question in the space provided on the answer sheet
corresponding to that question. Incorrect or missing units will count as an incorrect answer. Ambiguous
or illegible responses will be scored as incorrect. All questions are worth one point. In the event of a tie,
tiebreakers will be graded in order until the tie is broken.
1. What type of reflection produces a defined image?
a) diffuse
b) diffusing
c) specular
d) speculative
2. Which of these statements is NOT true?
a) If light is going into a material where it will travel faster, the light will bend AWAY from the
normal.
b) If light is going into a material with a greater density, the light will bend TOWARDS the normal.
c) If light is going into a material with a greater index of refraction, the light will bend AWAY from
the normal.
d) If light is going into a material with a greater density, the light will travel slower.
3. Light in air (assume nair = 1.0) strikes a diamond at an angle from the normal of 26°. If the index of
refraction of diamond is 2.42, at what angle from the surface is the light refracted through the
diamond? Write your answer to three significant figures.
4. Your sunglasses should be polarized _____________ to block the _______________ polarized glare
from the road, bodies of water, and the hood of your car.
a) vertically; vertically
b) horizontally; horizontally
c) horizontally; vertically
d) vertically; horizontally
5. A prism is illuminated by light entering as shown in the figure at right.
Assume angle CAB is 30°, angle ABC is 60°, and ACB is 90°. To three
significant figures, what is the minimum index of refraction the glass must
have so that no light leaves the glass through the side AB?
6. An object is placed at a distance equal to the focal length from a concave lens. What characteristics
will the image have?
a) It will be inverted, smaller, and real
b) It will be upright, smaller, and virtual
c) It will be inverted, larger, and virtual
d) None of the above is correct.
7. An object is placed near a converging mirror at a distance far beyond C. What characteristics will the
image have?
a) It will be larger, virtual, and upright.
b) It will be larger, real, and inverted.
c) It will be smaller, virtual, and upright.
d) It will be smaller, real, and inverted.
Optics Written Test
School Name:
Team Number:
8. An object placed 16 cm from a lens produces a virtual image 19 cm from the lens. What is the focal
length of the lens? Write your answer to three significant figures.
9. (TIEBREAKER #1) List the visible colors of light in order of increasing wavelength.
10. Cataracts are a clouding of what part of the eye?
11. The image formed in the eye of a person suffering from myopia is ___________ the retina.
a) in front of
b) behind
c) on
d) no image is formed
12. The overlap of blue- and red-colored light will show light of what color?
13. Yellow light shines on a blue paper. What color will the paper appear?
14. Which of the following are most commonly used in optical microscopes?
a) convex lens
b) concave lens
c) both convex and concave lenses
d) concave mirrors
e) convex mirrors
f) both convex and concave mirrors
15. What type of lens (converging or diverging) should be used in a pair of glasses to help a person with
hyperopia?
16. (TIEBREAKER #2) The diagram at right shows the path of
a ray of light traveling in a vacuum and striking an
equilateral triangular prism Assume the prism is made out of
glass, and that none of the angles A, B, C, and D are equal.
The light enters at an angle of 35° from the normal (angle A)
and travels through the prism at a speed of 2.00 x 108 m/s.
Find the angle of deviation to two significant figures.
For questions 17 – 19, refer to the spectrums shown at right.
17. Which spectrum shown is an emission spectrum?
18. Which spectrum shown is a continuous spectrum?
19. Which spectrum shown is an absorption spectrum?
Optics Written Test
School Name:
Team Number:
The following information applies to questions 20-24.
Light of wavelength 550 nm in air (assume nair = 1.0) enters water, making an angle of 50.0° with the
normal. The index of refraction of water is 1.33. To three significant figures,
20. Find the angle of reflection from the normal.
21. Find the angle of refraction (in degrees) from the normal.
22. Find the frequency, in Hz, of the light in the water.
23. Find the wavelength, in nm, of the light in the water.
24. (TIEBREAKER #3) What color of light is your answer to #23?
The remaining questions are on your answer sheet.
Optics Written Test
School Name:
Team Number:
Answer Sheet
1.
8.
11.
18.
2.
9.
12.
19.
3.
13.
20.
4.
14.
21.
5.
15.
22.
6.
16.
23.
17.
24.
7.
10.
25. An object is placed 25.0 cm from a convex lens, which has a focal length of 15.0 cm as shown. Draw
a ray diagram for this situation.
26. An object is placed 10.0 cm from a concave mirror, which has a focal length of 20.0 cm. Draw a ray
diagram for this situation.