# Fourth Hour Exam

## June 3, 1999

Statistics

High, 94%

Mean, 75%

Low, 54%

For every question, also consider as a possible answer

E) none of the above
1. Light
A) is an electromagnetic wave

B) is a transverse wave

C) has a wavelength between 400 nm and 700 nm

D) all of the above

2. Light

A) is an electromagnetic wave.

B) is a longitudinal wave.

C) requires a medium to be transmitted -- much like sound.

D) all of the above

3. The speed of light

A) was too fast for Galileo to measure

B) was not accurately measured or explained by Newton

C) was very accurately measured by A A Michelson

D) all of the above

4. The speed of light

A) was too slow for Galileo to measure

B) was measured by Ole Romer using astronomical data

C) was measured by A A Michelson using biological data

D) all of the above

5. When you view a white light source through a diffraction grating you will see brightly colored spectra with

A) red on the inside and violet on the outside

B) violet on the inside and red on the outside

C) yellow on the inside and green on the outside

D) yellow on the outside and green on the inside

6. When you see a rainbow, you see

A) red on the inside and violet on the outside

B) violet on the inside and red on the outside

C) yellow on the inside and green on the outside

D) yellow on the outside and green on the inside

7. The colored dots that make up the color on a TV screen are

A) red, yellow, green

B) red, yellow, blue

C) red, green, blue

D) cyan, magenta, yellow

8. Colors seen on TV result from color

A) subtraction

C) neither of these

D) either of these

9. Colors seen in paint result from color

A) subtraction

C) neither of these

D) either of these

10. Look at a full-color picture in a magazine with a magnifying glass and you will see that the inks used are

A) red, green, cyan, and blue.

B) red, green, blue, and black.

C) Cyan, Magenta, Yellow, and blacK. (CYMK)

D) cyan, green, yellow, and blue.

11. A mixture of red and blue light produces

A) blue

B) magenta

C) yellow

D) cyan

12. Initially, a camera is focused at a nearby person. It is then adjusted to focus on some far-distant mountains. To do this, the lens

a) is moved closer to the film.

b) is moved farther from the film.

c) is "opened" to larger aperature or larger opening.

d) is "shut down" to a smaller aperature or smaller opening.

13. Different colors are dispersed by a prism because different colors in the spectrum have different

A) angular momenta

B) speeds

C) energies

D) momenta

14. The critical angle for a transparent material is the angle at and beyond which all light within the material is totally

A) absorbed

B) reflected

C) refracted

D) polarized

15. Light will not pass through a pair of Polaroid filters when their axes are

A) parallel

B) rotated 45°

C) rotated 57°

D) perpendicular

16. Light from a laser is

A) monochromatic

B) in phase

C) coherent

D) all of the above

a) dilated or opened wide

c) blue

d) brown

18. Rainbows are a result of

A) dispersion and reflection.

B) dispersion and polarization.

C) reconstruction and polarization.

D) constructive and destructive interference.

19. An object is placed 60 cm from a converging lens that has a focal length of 20 cm. Make a ray diagram of this situation. From the ray diagram, characterize the image.

The image is

A) real, inverted, and larger.

B) real, inverted, and smaller.

C) virtual, upright, and smaller.

D) virtual, inverted, and smaller.

20. An object is placed 40 cm from a converging lens that has a focal length of 20 cm. Make a ray diagram of this situation. From the ray diagram, characterize the image.

The image is

A) real and inverted (and the same size)

B) virtual, inverted, and smaller.

C) virtual, upright, and smaller.

D) virtual, inverted, and larger.

21. An object is placed 30 cm from a converging lens that has a focal length of 20 cm. Make a ray diagram of this situation. From the ray diagram, characterize the image.

The image is

A) real, inverted, and larger.

B) real, inverted, and smaller.

C) real, upright, and smaller.

D) virtual, upright, and larger.

22. An object is placed 10 cm from a converging lens that has a focal length of 20 cm. Make a ray diagram of this situation. From the ray diagram, characterize the image.

The image is

A) real, inverted, and larger.

B) real, inverted, and smaller.

C) virtual, upright, and smaller.

D) virtual, upright, and larger.

23. The type of lenses needed to correct farsighted vision is

A) converging

B) diverging

C) convex

D) concave

24. A simple magnifier produces ...

A) a virtual image between the lens and your eye

B) a real image between the lens and your eye

C) a virtual image beyond the near point of your eye

D) a real image at infinity

25. A microscope uses the front lens or objective lens to produce a

A) virtual image which is right side up.

B) virtual image at infinity.

C) real image which is then viewed through the eyepiece.

D) real image which is right side up.

26. A telescope uses the front lens or objective lens to produce a

A) virtual image which is right side up.

B) virtual image at infinity.

C) real image which is then viewed through the eyepiece.

D) real image which is right side up.

27. In the interference pattern produced by shining a laser through two slits (Young's double slit experiment), the bright areas are the result of

A) destructive interference.

B) polarization.

C) constructive interference.

D) restructive construction.

28. A sheet of red paper will look black when illuminated with

A) red light

B) cyan light

C) yellow light

D) magenta light

29. The "near point" of a person's eye is

A) 25 cm

B) the farthest distance at which that person can clearly see an object

C) the nearest distance at which that person can clearly see an object

D) infinitly far away

30. The type of lenses needed to correct nearsighted vision is

A) converging

B) diverging

C) convex

D) concave

31. We see interference effects if a laser is shined at or through a double slit (this is Young's double slit experiment). We do not see interference effects due to the light coming from two flashlights because their light is

A) coherent.

B) incoherent.

C) too dim.

D) too bright.

32. In an optical system with two lenses,

A) the size of the final image is the magnification of the first lens multiplied by the object distance of the second lens

B) the magnification of the whole system is the sum of the magnifications of the two lenses

C) the image produced by the first lens is always virtual

D) the image produced by the first lens can be treated as an object for the second lens

33. A double rainbow requires

A) only one reflection inside the raindrops.

B) two reflections inside the raindrops.

C) constructive interference inside the raindrops.

D) destructive interference inside the raindrops.