Illuminance

What is the illuminance on a workbench if a lamp producing 2500 candela is placed 5 meters directly above it?

• 500 Lux

• 100 Lux

• 250 Lux

• 50 Lux

A lamp is placed 4 meters above point A. Point B is 3 meters horizontally from point A. What is the direct distance from the lamp to point B?

• 7 meters

• 5 meters

• 6 meters

• 4 meters

For a lamp 4 meters above point A, and point B 3 meters horizontally from A, what is the cosine of the angle between the vertical line from the lamp to A and the line from the lamp to B?

• 0.6

• 0.75

• 0.8

• 0.5

A lamp produces 1000 candela. If it is 4 meters directly above point A, and point B is 3 meters horizontally from point A, what is the illuminance at point B?

• 40 Lux

• 32 Lux

• 50 Lux

• 62.5 Lux