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.
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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Panoramic Ireland really enjoys photographing in Cork and the Kino has always been a colourful place on Washington Street, the main thoroughfare from the city centre towards the university.
The Kino was a cultural hub in the city but unfortunately was finished off by Covid and the lockdowns, now it hosts some Phoenix Nights themed events.
Seen here in better days with fine street art before the pandemic and a lockdown that was the most restrictive in the world.
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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.
It was a fine evening, alone in the countryside with only birds and the sound of the wind to disturb the silence.
Although we are close to midsummer, there are still plenty of fine summer evenings like these to photograph in Ireland for 2022.
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