Light, Nanometer, and Angstrom Units Quiz

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What is the range of wavelengths for light that the unaided human eye can perceive?

10 nm to 370 nm

1 mm to 800 nm

1 nm to 10 nm

370 nm to 800 nm (correct)

Which unit of length is used to express wavelengths of light in or near the visible spectrum?

Angstrom

Nanometer (correct)

Meter

Kilometer

What is the immediate wavelength range of ultraviolet radiation?

10 nm to 370 nm

1 mm to 800 nm

370 nm to 10 nm (correct)

800 nm to 1 mm

In which region of the electromagnetic spectrum does infrared radiation lie?

Contiguous to the red end of the visible spectrum Signup and view all the answers

What is a unit of luminous intensity that was used prior to 1946 and equal to the luminous intensity of a wax candle of standard specifications?

Candle Signup and view all the answers

What is the basic SI unit of luminous intensity defined as the luminous intensity of a source emitting monochromatic radiation of certain frequency and radiant intensity?

Candela Signup and view all the answers

What is the definition of Cross light?

Light originating from windows in adjacent walls Signup and view all the answers

Which type of sky is defined as having less than 30% cloud cover with the solar disk unobstructed?

Clear sky Signup and view all the answers

What is the primary function of the CIE (Commission Internationale de I’Eclairage)?

Developing standards for lighting Signup and view all the answers

What does the IES (Illuminating Engineering Society) focus on?

Developing standards for lighting Signup and view all the answers

In the Daylight factor method, what does the term 'daylight factor' measure?

The measure of daylight illuminance at a point on a given plane Signup and view all the answers

What characterizes an Overcast sky according to the CIE standard?

Less luminance near the sun compared to near the horizon Signup and view all the answers

What type of lighting is designed to provide a relatively high level of illumination over a small area?

Local lighting Signup and view all the answers

Which type of lighting is used to call attention to a particular object or feature?

Backlight Signup and view all the answers

What is the purpose of sidelight?

To come from the side Signup and view all the answers

Which type of lighting is known for producing high contrast and distinct shadows on the subject?

Direct lighting Signup and view all the answers

What percentage of emitted light is distributed downward in semi-direct lighting?

60% to 90% Signup and view all the answers

Which term is used to describe the sensation caused by excessively bright light in the visual field?

Glare Signup and view all the answers

What is the term for the change of direction of a ray of light as it passes obliquely from one medium to another?

Refraction Signup and view all the answers

Which term describes the modulation of light or sound waves as they bend around obstacles?

Diffraction Signup and view all the answers

What is the angle that a refracted ray makes with a normal to the interface between two media called?

Angle of refraction Signup and view all the answers

Which term refers to light being scattered from an irregular surface or diffusing through a translucent material?

Diffusion Signup and view all the answers

What does 'translucent' mean when referring to materials?

Capable of transmitting light but not clearly visible Signup and view all the answers

Which device is an example of a source for producing light or heat using electricity or gas?

Lamp Signup and view all the answers

What is luminance a quantitative measure of?

Brightness of a light source Signup and view all the answers

What unit of luminance is equal to 0.32 candela per square centimeter?

Lambert (L) Signup and view all the answers

What principle does the Law of Reflection describe?

Reflection of light Signup and view all the answers

What is the angle of reflection defined as?

Angle made by the reflected ray with a normal to the surface Signup and view all the answers

In what context does 'incidence' occur?