Photometry Fundamentals Quiz

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What is the basic unit of photometry used to express luminous flux?

Candela
Lux
Lumen (correct)
Footcandle

At which wavelength is bright vision best, according to the CIE standards?

550 nm
505 nm
555 nm (correct)
480 nm

What is the SI unit equivalent of one footcandle (fc)?

100 lx
10 lx (correct)
1 lx
1.5 lx

Which condition describes the response of the eye under bright-light conditions?

Photopic (C) Signup and view all the answers

What describes the luminous intensity emitted into the entire viewing area?

Luminance (B) Signup and view all the answers

Which photometric quantity measures the intensity of light incident on a surface?

Illuminance (D) Signup and view all the answers

What is the unit used to express luminance intensity?

Nit (C) Signup and view all the answers

Which of the following statements is true about the CIE's recognition of vision types?

Scotopic vision is associated with low-light conditions. (B) Signup and view all the answers

What is the primary unit used to express luminous flux?

Lumen (C) Signup and view all the answers

Scotopic vision is associated with the use of cones in the eye.

False (B) Signup and view all the answers

What is the luminous flux incident on one square foot called?

footcandle Signup and view all the answers

Luminance is expressed in units of ______.

candela per square meter Signup and view all the answers

Match the following photometric quantities with their descriptions:

Luminous flux = Total intensity of light from a source Illuminance = Intensity of light incident on a surface Luminance intensity = Luminous flux emitted into the viewing area Scotopic vision = Vision in low light conditions Signup and view all the answers

Which photometric unit is equivalent to one lumen per square meter?

Lux (D) Signup and view all the answers

The maximum photopic eye response occurs at a wavelength of 505 nm.

False (B) Signup and view all the answers

A solid angle is measured in ______.

steradians Signup and view all the answers

Lumen

The basic unit of photometry, scaled to the maximum photopic eye response at 555 nm.

Luminous Flux

The total intensity of light from a source, measured in lumens (lm).

Illuminance

The intensity of light incident on a surface, measured in lumens per square meter (lux) or footcandles (fc).