Characteristics Of Light

Question 1

Footcandle

Answer 1

Unit of illumination equal to one lumen per square foot. Originally defined by referring to a standard candle burning at 1 foot from a specific surface.

Question 2

Lumen

Answer 2

In simplified terms, the total amount of visible light in a beam emitted from a light source (luminous flux = quantity of energy of light emitted per second in all directions. Units= Lumens) luminous flux is often used as an objective measure of the use for light emitted by a light source and is typically reported on the packaging for lightbulbs. Luminous efficiency of an incandescent light bulb is set to 16 lumens per 1 watt.

Question 3

Lux

Answer 3

Measurement of luminous flux per unit area, the SI unit of illuminance equal to one lumen per square meter. Measurement of the intensity of light.

Question 4

1 foot candle is approximately equal to?

Answer 4

10.764 Lux

Question 5

List the wavelengths from shortest to longest

Answer 5

Gamma rays, x-rays, UV rays, blue visible light, orange visible light, infrared rays, microwaves, radio
Waves

Question 6

What’s equal to the Refraction of light ray

Answer 6

The angle of incidence equals the angle of reflection

Question 7

Angle of refraction

Answer 7

Angle of refraction is smaller than the angle of incidence been removed from air to glass