_____1. A typical laser pointer used in class to make a \"spot\" with light on a

Q: 1. A typical laser pointer used in class to make a \"spot\" with light on a

B will get half of the earlier angle inverted greater than 45 B B C A 1.7 c 1 m

ID: 2123762 • Letter: #

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_____1. A typical laser pointer used in class to make a "spot" with light on a screen has a power of about 5 mW. What other piece of information would you need in order to measure the intensity of the light provided by the pointer?>style="font-size: 12.000000pt; font-family: 'times new roman,italic'">style="font-size: 12.000000pt; font-family: 'times new roman'">style="font-size: 12.000000pt; font-family: 'times new roman'">style="font-size: 12.000000pt; font-family: 'times new roman'">

Wavelength of light>

Area of the "spot"style="font-size: 12pt; ">

Frequency of light>

Speed of light>

style="font-size: 12.000000pt; font-family: 'times new roman'">

_____ 2. A light beam reflects off of a plane mirror as shown at right. If the angle of incidence is cut in half compared to what's shown here, what is the new angle of reflection?>style="font-size: 12.000000pt; font-family: 'times new roman'">style="font-size: 12.000000pt; font-family: 'times new roman'">style="font-size: 12.000000pt; font-family: 'times new roman,italic'">style="font-size: 12.000000pt; font-family: 'times new roman'">

style="font-size: 12.000000pt; font-family: 'times new roman,italic'">style="font-size: 12.000000pt; font-family: 'times new roman'">style="font-size: 12.000000pt; font-family: 'times new roman'">style="font-size: 12.000000pt; font-family: 'times new roman,italic'">style="font-size: 12.000000pt; font-family: 'times new roman'">

55 degree

35 degree

27.5 degree

17.5 degree

_____ 3. The image in a single convex mirror is ALWAYS:>

virtual>

smaller than the object>

inverted>

A and B>

B and Cstyle="font-size: 12pt; ">

_____ 4. A light ray goes from water (n=1.33) into glass (n=1.62) at an incident angle of 45 degree. The angle of refraction is:>

greater than 45 degreestyle="font-size: 12pt; ">

equals to 45 degreestyle="font-size: 12pt; ">

less than 45 degreestyle="font-size: 12pt; ">

Impossible to determine with the information given>

_____ 5. In order to get a magnified (bigger than the object) image of an object with a lens, which is true?>

The lens is concave and So > f>

The lens is concave and So < f>

The lens is convex and So < f>

The lens is convex and So > f>

A or B>

______ 6. When light of different wavelengths passes through a converging lens, the rays of different wavelengths do not all have the same focal point. This phenomena is called...>style="font-size: 12.000000pt; font-family: 'times new roman'">

chromatic aberration>

spherical aberration>

bad luck>

______ 7. A diffraction pattern is projected onto a screen by passing a laser beam of 655 nm light through two slits. All of the following would move the bright spots in>

the pattern closer together EXCEPT:style="font-size: 12pt; font-family: 'times new roman,bold'; ">style="font-size: 12pt; font-family: 'times new roman'; ">style="font-size: 12.000000pt; font-family: 'times new roman'">

      a. Move the slits closer to the screen.
      b. Use 540 nm light
      c. Move the slits further apart
      d. Use more than two slits
      e. All of the above would move the spots closer.>

______ 8. To design an eye with better resolving power than the human eye, which of these would work best?style="font-family: 'times new roman'; font-size: 16px; ">style="font-size: 12pt; font-family: 'times new roman'; ">style="font-size: 12.000000pt; font-family: 'times new roman'">

Smaller pupil and able to sense infrared light>

Smaller pupil and able to sense ultraviolet light>

Larger pupil and able to sense infrared light>

Larger pupil and able to sense ultraviolet light>

Either A or B would work equally well>

______9. If you were on a spaceship moving toward the sun at 0.7c, you would measure the speed of light from the sun as:>

1.7 c>

0.7 c>

0.88 c>

This can't be determined without more information>

_____ 10. A person on a spaceship traveling away from earth at 0.88c holds a meter stick (length 1.0 m) in her hand. What length does she measure for the meter stick?style="font-size: 12pt; font-family: 'times new roman'; ">

2.1 mstyle="font-size: 12pt; ">

1.0 mstyle="font-size: 12pt; ">

0.48 mstyle="font-size: 12pt; ">

0.23 mstyle="font-size: 12pt; ">

More information is needed to calculate the lengtstyle="font-size: 12pt; ">

style="font-size: 12.000000pt; font-family: 'times new roman'">

11. At a point 1.0 m from a light bulb, an unpolarized intensity of 8.0 W/m2 is measured.style="font-family: 'times new roman'; font-size: 12pt; ">style="font-size: 12.000000pt; font-family: 'times new roman'">

If you now place a polarizer 1.0 m from the bulb, what is the intensity of the light after passing through the polarizer?

The light, after passing through the polarizer in part b, now passes through a second polarizer with its axis rotated 35 degrees with respect to the first polarizer. What is the new intensity?style="font-size: 12pt; ">

Explanation / Answer

will get half of the earlier angle

inverted

greater than 45

1.7 c

1 m

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_____1. A typical laser pointer used in class to make a \"spot\" with light on a

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