Discussion
A room with a window head 2.5 m above floor level can be daylit usefully to a depth of about
Answer: A
Correct answer: 5 m
The usual rule is that daylight penetrates usefully to about twice the height of the window head above the floor, so \[ 2 \times 2.5 = 5\ \mathrm{m}. \] It is the head height rather than the window area that governs, which is why a tall narrow window daylights a room more deeply than a wide low one of the same area.
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