The Process of seeing

Question 1

It passes through the focusing____” and strikes the _______ to form the optical image pattern.

Answer 1

Lens, Retina

Question 1

Light enters the eye through the transparent outer membrane surrounding the eye called the ________

Answer 1

Cornea

Question 2

The _____ (colored portion of the eye) acts as a diaphagm to expand or contract the_______ which controls the amount of light that is allowed to enter the eye.

Answer 2

Iris, Pupil

Question 3

The retina contains two special types of optic nerve receptors which permit vision-the _____ and the _____.

Answer 3

Rods, Cones

Question 4

What is a retina?

Answer 4

The retina is the light-sensitive surface at the back of the eye where a delicate film of nerve fibers branch out from the optic nerve

Question 5

What is a rod and cone part of the retina?

Answer 5

The rods provide sensitivity to brightness, allowing us to see at low levels of light; while the cones allow us to perceive finer details, and to distinguish colors.

Question 6

What are the four fundamental factors governing the visibility of a task?
1._______
2._______
3._______
4._______

Answer 6

1. Size
2. Brightness
3. Contrast
4. Time

Question 7

A good lighting system provides both the ________ of light, and the _______ of light to improve the performance of difficult visual tasks

Answer 7

Quantity, Quality

Question 8

Light is a special form of _________ which produces the sensation of sight.

Answer 8

Electromagnetic Radiation

Question 9

The wavelength of visible light from approximately _____ nanometres to _____ nanometres.

Answer 9

380nm to 760nm

Question 10

By passing a beam of white light through a prism, the beam will spread and separate into individual visible wavelengths know as a ___________.

Answer 10

Color Spectrum (Rainbow)

Question 11

Which of the following light colours is the human eye most sensitive to?

Answer 11

Yellow - Green

Question 12

The human eyes is not equally sensitive to all colours (wavelengths), and tests have shown that the average eyes is most responsive to a wavelength of about ____ nanometres, or in the _________ colour range.

Answer 12

555nm, yellow - green

Question 13

what unit degrees is expressed in colour temperature?

Answer 13

degree Kelvin (K)

Question 14

What is a colour temperature?

Answer 14

It is a measurement of light quality.
It is used to define the color appearance of a light source

Question 15

REMEMBER THIS!!

Answer 15

Source with low colour temperatures - below 3000 K- have “warm” colour (reddish or yellowish); while sources with high colour temperature above 4000 K- have “cool” colour (bluish)

Question 16

What does CRI stand for?

Answer 16

Color Rendering Index?

Question 17

What is Color Rending Index? (CRI)

Answer 17

Color rendition expresses the ability of a light source to portray the color appearance of objects accurately when compared to
a standard (reference) light source of the same color temperature.