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Flashcards in 1. Light and Vision Deck (15)
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Light

(Definition)

Electromagnetic energy.

1

Between what electromagnetic energy wavelengths does the human eye respond to?

Ultraviolet and Infrared

2

What portion of the spectrum is the human eye most responsive to?

(Colour)

Yellow-Green

3

Light output measured in...

(unit)

Lumens (lm)

4

Luminous Intensity is the...

Intensity of light.

5

Luminous Intensity measured in...

(Unit)

Candelas (cd)

6

When light strikes a surface, it is called...

Illuminance

7

Illuminance is measured in...

(Unit)

Footcandles (fc)

8

1 footcandle (fc) =

The illumination on a surface one foot away from a "standard candle."

a.k.a. One lumen per square foot.

9

Brightness

(Definition)

Light transmitted/reflected off of a surface.

10

Brightness is also called...

Luminance

11

How is Luminance measured?

Candelas per square meter.
cd/sq. m

12

Visual Field

(Definition)

The area the eye sees.

13

In degrees, what is the area that the eye can see?

180 degrees in the horizontal plane
130 degrees in the vertical plane

14

In degrees, the area of sharp detail that the eye can see...

2 degrees