Deck 1: Light, Electromagnetic Waves, and Vision

Question 1

Of the following, _________ has the maximum frequency.

A)uv rays
B)gamma rays
C)microwaves
D)radio waves

Answer 1

gamma rays

Question 2

In the Visible spectrum the ______ colour has the maximum wavelength.

A)violet
B)blue
C)red
D)yellow

Answer 2

red

Question 3

Wavelength and frequency are related as : (c = speed of light)

A)c = wavelength / frequency
B)frequency = wavelength / c
C)wavelength = c * frequency
D)c = wavelength * frequency

Answer 3

c = wavelength * frequency

Question 4

Electromagnetic waves can be visualised as a

A)sine wave
B)cosine wave
C)tangential wave
D)none of the above

Question 5

How is radiance measured?

A)lumens
B)watts
C)armstrong
D)hertz

Question 6

Which of the following is used for chest and dental scans?

A)hard x-rays
B)soft x-rays
C)radio waves
D)infrared rays

Question 7

Which of the following is impractical to measure?

A)frequency
B)radiance
C)luminance
D)brightness

Question 8

Massless particle containing a certain amount of energy is called

A)photon
B)shell
C)electron
D)none of these

Question 9

What do you mean by achromatic light?

A)chromatic light
B)monochromatic light
C)infrared light
D)invisible light

Question 10

Which of the following embodies the achromatic notion of intensity?

A)luminance
B)brightness
C)frequency
D)radiance

Question 11

Which of the following is a receptor in the retina of human eye?

A)rods
B)cones
C)rods and cones
D)neither rods nor cones

Question 12

How is image formation in the eye different from that in a photographic camera

A)no difference
B)variable focal length
C)varying distance between lens and imaging plane
D)fixed focal length

Question 13

Range of light intensity levels to which the human eye can adapt (in Log of Intensity-mL)

A)10^-6 to 10^-4
B)10⁴ to 10⁶
C)10^-6 to 10⁴
D)10^-5 to 10⁵

Question 14

What is subjective brightness?

A)related to intensity
B)related to brightness
C)related to image perception
D)related to image formation

Question 15

What is brightness adaptation?

A)changing the eye's overall sensitivity
B)changing the eye's imaging ability
C)adjusting the focal length
D)transition from scotopic to photopic vision

Question 16

The inner most membrane of the human eye is

A)blind spot
B)sclera
C)choroid
D)retina

Question 17

What is the function of Iris?

A)source of nutrition
B)detect color
C)varies focal length
D)control amount of light

Question 18

________ serve to a general, overall picture of the field of view.

A)cones
B)rods
C)retina
D)all of the mentioned

Question 19

Ratio of number of rods to the number of cones is _______

A)1:20
B)1:2
C)1:1
D)1:5

Question 20

The absence of receptors is in the retinal area called _____________

A)lens
B)ciliary body
C)blind spot
D)fovea

Question 21

The most familiar single sensor used for Image Acquisition is

A)microdensitometer
B)photodiode
C)cmos
D)none of the mentioned

Question 22

A geometry consisting of in-line arrangement of sensors for image acquisition

A)a photodiode
B)sensor strips
C)sensor arrays
D)cmos

Question 23

CAT in imaging stands for

A)computer aided telegraphy
B)computer aided tomography
C)computerised axial telegraphy
D)computerised axial tomography

Question 24

The section of the real plane spanned by the coordinates of an image is called the _____________

A)spacial domain
B)coordinate axes
C)plane of symmetry
D)none of the mentioned

Question 25

The difference is intensity between the highest and the lowest intensity levels in an image is ___________

A)noise
B)saturation
C)contrast
D)brightness