PSC20 – PW3 Review
1. The distance from Saskatoon to Lucerne, Switzerland is 4575.2 miles. How long would
it take light to travel there?
2. Usain Bolt ran the 100 m race in 9.58 seconds, faster than any other human. How far
would light travel in that time?
3. Blue light has a wavelength of 470 nm. What is the frequency?
4. Yellow light has a frequency of 525 THz. What is the wavelength?
5. Light travels through a liquid at 2.81 x 108 m/s. Find the index of refraction of that liquid?
6. What is the speed of light in a substance that has an index of refraction of 1.93?
7. What is the angle of incidence when light passes from air into diamond with an angle of
refraction of 23.5°?
8. What is the speed of light in a medium if the angle of incidence in air is 24.0º and the
angle of refraction is 19.8º?
9.
Find the critical angle for light travelling from a diamond into water.
10. The critical angle for an unknown substance is 42.3˚. Find the index of refraction of that
substance and the speed of light in the substance.
11. The critical angle for an acrylic block is 41.3˚. How long would it take light to travel
through a 3.50 cm block?
12. Light travels 2.15 x 108 m/s in an unknown substance. If a light ray in air strikes the
block at an angle of incidence of 24.9°, what would the angle of refraction be in the
block?
13. An object is 3.0 cm from a convex lens and it produces a virtual image that is 4.5 cm
from the lens. Calculate the focal length?
14. The magnification of a converging lens is -0.45X. If an object is 5.8 cm tall and is placed
15.0 cm from the lens, calculate the image height and distance.
15. If an image is produced 3.5 cm from a diverging lens that has a focal length of 6.0 cm,
calculate the object distance. If the image is 0.75 cm tall, what is the object height and
magnification?
16. Draw the following to find image characteristics in a converging lens:
a. f = 4.0 cm
do = 7.5 cm
ho = 1.0 cm
b. f = 3.5 cm
do = 7.0 cm
ho = 1.5 cm
c. f = 6.5 cm
do = 3.0 cm
ho = 1.0 cm
17. Draw the following to find image characteristics in a diverging lens:
a. f = 4.0 cm
do = 7.5 cm
ho = 1.0 cm
b. f = 7.0 cm
do = 7.0 cm
ho = 1.5 cm
18. Define the following parts of the eye:
a. Ciliary muscle
b. Lens
c. Pupil
d. Sclera
e. Optic nerve
f. Blind spot
g. Vitreous humour
h. Aqueous humour
i. Retina
j. Iris
k. Cornea
l. Rods
m. Cones
ANSWERS TO NUMERICAL QUESTIONS
1. 0.0244 s
2. 2.87 x 109 m
3. 6.4 x 1014 Hz
4. 5.71 x 10-7 m
8
5. 1.07
6. 1.55 x 10 m/s
7. 74.7°
8. 2.50 x 108 m/s
9. 33.3°
10. 1.49 ; 2.02 x 108 m/s
11. 1.77 x 10-10 s
12. 17.6°
13. 9.0 cm
14. -2.6 cm; 6.8 cm
15. 8.4 cm; 1.8 cm; 0.42X
16a. Real, inverted, larger
b. Real, inverted, same size
c. Virtual, erect, larger
17a. Virtual, erect, smaller
b. ???