When we double the distance between a source of light and the surface on which it falls, the amount of illumination on the surface

Question

When we double the distance between a source of light and the
surface on which it falls, the amount of illumination on the surface
decreases to
(what fraction) of the
original illumination.

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Thanh Thu 5 years 2021-08-15T15:38:15+00:00 1 Answers 149 views 0

Answers ( )

  1. lethu
    0
    2021-08-15T15:39:26+00:00
    Reply

    When we double the distance between a source of light and the

    surface on which it falls, the amount of illumination on the surface

    decreases to one fourth (1/4, 0.25)) of the original illumination.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )