The illumination from a source of light vries inversely as the square of the distance A book is at - Maths - Comparing Quantities

Question

The illumination from a source of light vries inversely as the
square of the distance A book is at a distance 9 dm from a lamp
Find how much farther the book is to be moved so that it received
one third as much light

I know what's variation so no answers like its of higher concept
and no similar link

Deepak Kumar · Accepted Answer

Dear Student,
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5a13381ddf9c3%20jpg"
style="width: 496px; height: 1023px;">

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