Simply put, reflectance is defined as a "measure of the ability of a surface to reflect light or other electromagnetic radiation".
While the polariser hasn't changed the amount of light leaving the surface of the an object, in this case bracken on the hillside, it has remained the same - but the polariser has prevented some of that light from reaching the lens and sensor.
In this case, the striking green landscape of Ireland's Wicklow Mountains, we can easily see the difference between the polarised and non-polarised image.
It is a difficult photograph to shoot a landscape like this contre-jour but the movement and colour in the sky, coupled with some good post-processing has resulted in a fine image that is in contrast to shooting with the sun and its clear light (image coming soon in a subsequent post).
Making use of the texture and feeling of this deserted Irish beach at sunset.
On those rainy, cloudy days where the sun really doesn't make an appearance the light is still great for photography.
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In fairness, Dublin's Phoenix Park did see 33C in 2022, the second highest temperature recorded in Ireland after the record 33.3C in Kilkenny set in 1887.
I'm not complaining, the stormy weather was much more interesting for photography than sunny, warm and hazy heatwave conditions would have given; crashing waves showing the power of the Atlantic as it meets the geological landscape of these cliffs.
Indeed these cliffs as you see them rise steeply for 100 to 120m above the deep blue ocean below, the rocks here are amongst Ireland's oldest, dating to the Pre-Cambrian.