Deck 6: The Physics of Vision & Light and the Eye

Question 1

Which property of light is important for understanding how it behaves when passing through small apertures? Light as

A) Rays.
B) Particles.
C) Waves.
D) Energy

Answer 1

C

Question 2

Which of the following statements about visual angle is not correct? Visual angle:

A) is the angle between the lines of sight of the two eyes.
B) can be calculated using trigonometry.
C) is the angle subtended by an object at the centre of the lens.
D) depends jointly on the size of object size and viewing distance.

Answer 2

A

Question 3

Optical power is expressed in which one of the following measures?

A) Dioptres
B) nm
C) candelas
D) Visual angle

Answer 3

A

Question 4

Which term describes aged-related loss in accommodative range?

A) Presbyacusis
B) Myopia
C) Presbyopia
D) Hyperopia

Question 5

The diameter of the pupil varies between approximately

A) 10-15 mm
B) 7-10 mm
C) 0.5-2 mm
D) 2-7 mm

Question 6

Which one of the following statements about rods and cones is not correct?

A) There are far more cones than rods in each eye.
B) Cone pigments are much less sensitive to light than rod pigments.
C) The fovea contains only cones.
D) Cones are wider than rods near the fovea.

Question 7

Which one of following terms correctly describes the jerky, rapid, eye movement used to shift eye direction?

A) Pursuit movement
B) Saccade
C) Optokinetic nystagmus
D) Vestibular-ocular movement

Question 8

Which one of the following eye movements is triggered by head deceleration or acceleration?

A) Optokinetic nystagmus
B) Vergence eye movement
C) Vestibular-ocular movement
D) Saccade

Question 9

Binocular fixation on a point close to the observer requires:

A) Parallel lines of sight in the two eyes
B) A large convergence angle
C) Monocular vision
D) No accommodation

Question 10

Which one of the following is unlikely to result in a decrease in pupil size?

A) entering brightly lit room
B) Scotopic light levels
C) normal aging
D) boredom
E) Divergence of the eyes

Question 11

Who first proposed the theory of quantum mechanics, in which light is both a wave and a particle?

A) Albert Einstein
B) Max Planck
C) Thomas Young
D) James Clerk Maxwell
E) Isaac Newton

Question 12

The function describing energy emitted by a light source as a function of wavelength is called its

A) Spectral reflectance function
B) Spectral power distribution
C) Colour spectrum
D) The illuminant function.

Question 13

Ray properties of light are useful for:

A) Explaining interference patterns.
B) Understanding how images are formed by optical devices.
C) Explaining colour sensations.
D) Explaining sensitivity in low light.

Question 14

Which of the following is the range in which humans can typically detect wavelength?

A) 400 to 700 nm
B) 40 to 70 nm
C) 700 to 1400 nm
D) 400 to 800 nm
E) 300 to 600 nm

Question 15

Which one of the following is the correct sequence of colours in the visible spectrum?

A) yellow- red-orange-green-blue-indigo-violet
B) orange-red- yellow-green-blue-indigo-violet
C) red-orange-yellow-green-blue-violet- indigo
D) red-orange-yellow-green-blue-indigo-violet

Question 16

Which of the following does not contribute to increased spatial resolution in the eye?

A) Long photoreceptor length
B) Long focal length
C) Small receptor spacing
D) Small inter-receptor angle

Question 17

To achieve a high level of sensitivity at low light levels is would be best to have:

A) High image magnification
B) A small eye
C) Closely spaced photoreceptors
D) A large number of rod photoreceptors

Question 18

Which of the following is defined as a measure of relative luminance?

A) Intensity
B) Wavelength
C) Reflectance
D) Contrast

Question 19

Luminous energy emitted by an extended light source is measure in which units?

A) Watts
B) Candelas
C) Radiant flux
D) Trolands