Illumination Recap

In lighting what does the letter E stand for?

• Emf, volts

• Flux, Lumens

• Intensity, Candela

• Illumination, Lux

What is a luminaire?

• The lamp

• The lamp holder

• Wiring

• Socket

• All of the above

What is the unit of measurement for illumination?

• Ohm

• Lux

• Wem

The illumination at point O on the screen is E. In which direction does the light source should be moved to increase the illumination at point O ?

• Only 1

• Only 2

• Only 3

• 2 and 4

• 2,3 and 4

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

The units for luminous flux, illuminance and luminous intensity, respectively, are

• lumen, candela and lux

• lux, candela and lumen

• candela, lux and lumen

• lumen, lux and candela

Luminous flux depends on the distance from the light source.

• True

• False

Which statement is correct?

• The illuminance is directly proportional to the distance from the luminous source.

• The illuminance is directly proportional to the square of the distance from the luminous source.

• The illuminance is inversely proportional to the distance from the luminous source.

• The lluminance is inversely proportional to the square of the distance from the luminous source.

What is the correct formula for calculating the illumination at a point to one side of the base of a lamp column?

• $E=\frac{I}{d^2}$

• $E=\frac{I\ \sin\theta}{d^2}$

• $E\ =\ \frac{I\cos\theta}{d^2}$

• $E=\frac{I\cos\theta}{F^2}$

Tags

NGSS.HS-PS4-3

Luminous flux depends on the distance from the light source.

• True

• False

Which of the following statement(s) is true ?

I. The unit of luminous flux is lumen.

II. The unit of luminous intensity is candela.

III. The unit of illumination is lux.

• Only I

• Only II

• Only III

• I and II

• I,II and III