Unit Review Questions

Question 1

What is radiant energy?

Answer 1

Any form of energy radiating from a source.

Question 2

Wavelength is measured by the:

Answer 2

Distance between corresponding parts of two consecutive waves.

Question 3

The number of waves that pass a fixed point in a given unit of time is called:

Answer 3

Frequency

Question 4

What is another word for frequency?

Answer 4

Hertz

Question 5

Which part of the electromagnetic spectrum can be observed by the human eye?

Answer 5

400-700 nanometers

Question 6

Which color of light do you see when viewing the entire range of wavelengths in the visible spectrum at one time?

Answer 6

Red

Question 7

What do we call the bending of light rays?

Answer 7

Refraction

Question 8

Dispersion is defined as the:

Answer 8

Separation of white light into its constituent colors.

Question 9

Light that is made to vibrate in only one plane is:

Answer 9

Polarized

Question 10

If Kelvin temperature registers at 5,500 K, which color of light is dominant?

Answer 10

Blue

Question 11

Which temperature reading is the approximate color temperature of fluorescent light?

Answer 11

4,800 K

Question 12

How is hard light characterized?

Answer 12

Intense, directional, creating harsh shadows.

Question 13

When light reflects from a point on an object through the lens, the distance (between the point and the object) at which the rays of light are considered parallel is called:

Answer 13

Infinity

Question 14

Which two factors determine lens speed?

Answer 14

Focal length of the lens and diameter of the aperture opening.

Question 15

When the f/stop decreases from f/16 to f/8, the amount of light reaching the focal plane at f/8 is:

Answer 15

Four times as much

Question 16

Hyperfocal distance of a camera lens is the distance:

Answer 16

From the optical center of a lens to the nearest point in focus when the lens is focused on infinity.

Question 17

Which two factors may vary the hyperfocal distance of a camera lens?

Answer 17

Focal length and aperture

Question 18

Which procedure will increase the depth of field for a lens?

Answer 18

Closing down one f/stop

Question 19

The ability of a photographic lens or material to reproduce fine detail is called:

Answer 19

Focus

Question 20

Photographing a test pattern at a greatly reduced scale and then examining the image under adequate magnification is the normal method of measuring:

Answer 20

Resolving power

Question 21

Which method is the only way to compensate for lens distortion?

Answer 21

Increase the camera’s distance from the subject.

Question 22

The inability of a lens to bring wavelengths of white light into focus at the same plane is called:

Answer 22

astigmatism

Question 23

Identify the cause of optical flare.

Answer 23

Internal reflections from glass-to-air surfaces of the lens.

Question 24

Which problem has been practically eliminated by the practice of coating lenses?

Answer 24

optical flare

Question 25

Which characteristic is an added benefit derived form lens coating?

Answer 25

Increased lens transmission of light.

Question 26

Lens coverage of a normal lens is very near the angle covered by the human eye or about:

Answer 26

45 degrees

Question 27

Which lens is the best choice for most investigative assignments?

Answer 27

Normal

Question 28

Which factor is one disadvantage of using a wide-angle lens?

Answer 28

Converges parallel lines from the edges towards the center of the lens.

Question 29

The basic design of a telephoto lens includes:

Answer 29

A positive element in front of and separated from a negative rear element.

Question 30

Which feature is an advantage of a zoom lens?

Answer 30

You can vary focal length much faster than you can change lenses.

Question 31

Macro photography ends and photomicrography (with microscope lens) begins at enlargements of about:

Answer 31

10x

Question 32

Which of the following characteristics is a disadvantage of a macro lens?

Answer 32

Extremely short depth of field.

Question 33

As a minimum, how often should you clean your lenses?

Answer 33

After every photographic mission or at the end of each day of shooting.

Question 34

If you rub your lens shade too hard while cleaning it what could happen to the lens?

Answer 34

The protective black paint might come off and cause reflections.