Inverse squares kick in at large distances, 60cm or so is not a large distance. More importantly, anything diminishes electromagnetic radiation better than distance[0], and there is simply more matter between the bottom of the laptop and your lap and the top of the laptop and your brain.
Really, however, my main point is that the few milliwatts allowed for consumer electronics are well within the safe range – I have to admit, though, of being too lazy to search out the data, sorry.
[0] Just think about how easy it is to block light coming from the sun with a piece of paper.
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Inverse squares kick in at large distances, 60cm or so is not a large distance. More importantly, anything diminishes electromagnetic radiation better than distance[0], and there is simply more matter between the bottom of the laptop and your lap and the top of the laptop and your brain.
Really, however, my main point is that the few milliwatts allowed for consumer electronics are well within the safe range – I have to admit, though, of being too lazy to search out the data, sorry.
[0] Just think about how easy it is to block light coming from the sun with a piece of paper.