M

Manisha Agrawal • 9.34K Points
Tutor III

Q. In which case artificial lighting is necessary?

  • (A) Where the recommended illumination levels have to be obtained by artificial lighting only.
  • (B) To supplement day lighting when the level of illumination falls below the recommended value.
  • (C) Where visual task may demand a higher level of illumination.
  • (D) all of the above
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